The purpose of these rules is to protect and improve the general health and welfare of the people of the State of Vermont in the fields of environmental sanitation, water treatment, domestic supply and hydronically related hot water heating, by authorizing and enforcing rules and regulations for properly designed, acceptably installed and adequately maintained plumbing, water treatment and hydronically related water heating systems and by licensing qualified plumbers and qualified heating and water treatment specialists. These rules are enacted in conformance with the Vermont statutes covering plumbers and plumbing.
Existing public buildings, and all other existing buildings or facilities which are on public water systems or public sewage systems must comply with these rules whenever the plumbing in those buildings or premises is changed, replaced, or altered. These rules shall not apply to existing private dwellings and public buildings except as the plumbing systems in them may be altered in the future.
All new plumbing must comply with the current Vermont State Plumbing Code.
The Commissioner of Public Safety or a designated representative may:
The owner of the building or structure, or a designated representative shall:
To become licensed to do plumbing work in the State of Vermont an applicant must meet the requirements established in the following sections:
Any person who completes an application for a master plumber's license, presents documentation of having held a valid journeyman plumber's license under this chapter for a least 12 months, or documents equivalent training and experience in or outside of this state acceptable to the board, and pays an examination fee in an amount determined by the board based on the costs associated with administering the examination, shall be entitled to an examination.
Upon successful completion of the examination and payment of a licensing fee, the applicant shall receive a master plumber's license in the form of a wallet-sized card. The license shall be carried by the master plumber at all times while performing the licensee's trade and shall be displayed upon request. Upon request of a license holder, a license certificate, suitable for framing, shall be available for a fee.
Any person who completes an application for a journeyman plumber's license and documents apprenticeship in plumbing which includes both instruction and practice in work processes as verified by the Vermont apprenticeship council, or equivalent training and experience in or out of this state acceptable to the board, and pays an examination fee to be determined by the board based on the costs associated with administering the examination, shall be entitled to examination. Upon successful completion of the examination and payment of a licensing fee, the applicant shall receive a journeyman plumber's license in the form of a walletsized card. The license shall be carried by the journeyman at all times while performing the licensee's trade and shall be displayed upon request. Upon request of a license holder, a license certificate, suitable for framing, shall be available for a fee.
Any person who completes an application for a specialist's license and documents apprenticeship in plumbing which includes both instruction and practice in work processes as verified by the Vermont Apprenticeship Council, or successful completion of instruction, training and experience in or out of the state acceptable to the board and pays an examination fee to be determined by the board based on the costs associated with administering the examination, shall be entitled to an examination.
Upon successful completion of the examination and payment of a license fee, the applicant shall receive a specialist license in the form of a wallet-sized card. The license shall be carried by the licensee at all times while performing the licensee's specialty and shall be displayed upon request. Upon request by the license holder, a specialist license suitable for framing shall be available for a fee. A specialist license shall indicate each specialty for which the licensee has been approved. A specialist license does not take the place of any other license required by law.
Specialty fields for limited licenses include the following:
A person duly licensed as a specialist under this section may perform specialty limited use work, either as an employee or as an independent contractor only in connection with the specialty field designated on the person's license. A specialist may perform a supply connection to an existing water supply for test and related system operation, but at no time shall any specialist perform any plumbing or heating work that is not specified or permitted under the specialist's license.
The intent of these rules as they apply to the installation of fixtures and plumbing related to specialist licenses is to ensure the safety of the potable water supply. It is not the intent of these rules to regulate the operation, efficiency or consumer satisfaction of water heaters, hydronic heating systems, or water treatment equipment. The Vermont Fire and Building Safety Code and the Vermont Electrical Safety Rules regulate the safe operation of water heaters, hydronic heating systems, water treatment equipment and the related fuel or power source.
Appropriate licenses without examination may be issued to the following applicants upon payment of the required fee:
Plumbing license and 2 year renewal fees* shall be as established under 26 V.S.A. Section 2193(c) as follows:
* Subject to fee change by Legislative Process
A person may file a complaint with the board by doing so in writing, setting forth a full statement of the facts concerning the alleged infraction of the plumber's licensing statute or rules. In the event a complaint is filed with the Board, the Board's investigation shall not be limited to the matter set forth in the request for investigation but may extend to any act coming to the attention of the board which appears to violate the statute or these rules.
The process for inspection and review of plumbing work, identified as a priority for inspection and review under Section 18 of these rules, shall be as follows:
Plumbing plans are not required for the plumbing work covered under these rules unless, in the opinion of the Commissioner or a designated representative, the job is of sufficient size or complexity to warrant such plans.
A plumbing system installed under these rules shall not be covered unless it is first inspected by a plumbing inspector. The provisions of this section may be specifically waived by a designated representative.
New plumbing installations shall not commence unless a work notice has been validated by the department.
Priorities for inspection, review and investigation are established, consistent with 26 V.S.A. 2173 (b), based on the type and size of the building, the complexity of the plumbing work and consideration of health risks to persons or property resulting from potential plumbing code violations, as follows:
The approval of materials, equipment and devices and alternatives and variances to this code, shall be in accordance with Section 105 of the 2018 International Plumbing Code.
A person aggrieved by an interpretation of these rules, or the result of any inspection or an order to correct code violations may request that the Commissioner or designated representative reconsider such refusal or order. A request for reconsideration shall be made within 15 days after receipt of written notice of such refusal or order. The Commissioner or designated representative shall review the refusal or order within 30 days of the date the request for reconsideration is received. The Commissioner or designated shall issue an order amending, modifying or affirming the prior refusal or order as circumstances require within 30 days of the date of the review. A person aggrieved by the decision under this section may appeal to the superior court.
THE 2021 INTERNATIONAL PLUMBING CODE
All references to the International Building Code, International Residential Code (IRC), the International Fuel Gas Code or the International Mechanical Code in the 2021 IPC are deleted and replaced with the current Vermont Fire and Building Safety Code, including NFPA 31, 54, 58 and 211 http://firesafety.vermont.gov
Food and lodging Service Establishments shall conform to Vermont Health Department regulations (800-439- 8550) http://healthvermont.gov.
Public and private water systems, and underground injection control shall conform to the regulations of the Agency of Natural Resources (ANR) Drinking Water and Ground Water Protection Division (802- 828-1535) http:drinkingwater.vt.gov/.
Stormwater management shall conform to the regulations of ANR's stormwater program. (802-828- 1535) https://dec.vermont.gov/watershed
-delete and replace - Section 101.1 Title: These rules shall be known as the 2021 Vermont Plumbing Rules (hereinafter referred to as "this code").
-delete and replace- Section 101.2: Scope: The design and installation of plumbing systems including sanitary and storm drainage, sanitary facilities and water supplies, storm water and sewage disposal, located within the building and the connecting pipes within 10 feet of the building, shall comply with the requirements of this code. The design and installation of gas piping and the design and installation of fire sprinkler and standpipe systems shall be in accordance with the Vermont Fire and Building Safety Code.
-delete - Section 101.3
-delete and replace- Section 102.2 Existing Installations: Existing public buildings, and all other existing buildings or facilities must comply with these rules whenever the plumbing in those buildings or premises is changed, replaced, or altered as required by section 102.4.
-delete- Section 103 Code Compliance Agency
-delete and replace- Section 104: Duties and Powers of the Code Official: The Commissioner of the department of Public Safety or designee shall be designated as the code official for the purpose of this code. The code official shall have the authority to render interpretations of this code and to adopt policies and procedures to clarify the application of its provisions. Such interpretations, policies and procedures shall be in compliance with the intent and purpose of this code.
-delete- Section 106 Permits: Except for 106.5.7 Posting of Permit: The permit (work notice) or a copy shall be kept on the site of the work until the completion of the project. [Note: See sections 14 and 15 of these rules in regards to work notices]
-delete and replace- Section 108.2 Required Inspections and Testing: The holder of the permit shall be responsible for notifying the code official to schedule inspections required by these rules and other inspections and testing as required by sections 108.2.1 through and including 108.4.3
-delete- Section 109 Fees
-delete- Section 115 Violations
-delete- Section 114 Means of Appeal: [Note: See section 20 in regard to reconsideration]
-delete - APPENDIX F: BOARD OF APPEALS: [Note: See section 20 in regard to reconsideration]
-amend - Section 202 General Definitions
"BOILER" includes all steam, hydronic boilers, and water source heat pump units.
"HYDRONIC UNIT HEATER" includes: all hydronic kick space heaters, hydronic fan assisted cabinet heaters, and hydronic fan/coil air handlers
LEAD-FREE PIPE AND FITTING. See Chapter 605.2.1 Pipe and fittings used for human consumption (water for drinking or cooking) shall meet the most recent NSF/ANSI low lead standard (<0.25% weighted average lead content-wetted surface). For additional information contact the office of the Attorney General at (802-828- 3171) or
AGO. lead@state.vt.us.
See also http://ago.vermont.gov/assets/files/LeadinPlumbing.pdf
MAINTENANCE. To keep existing plumbing fixtures and associated piping in good working order. Does not include relocation of fixtures or piping.
PLUMBING. The art of installing pipes, fixtures and other apparatus for bringing in the water supply and removing liquid and water carried wastes and drainage venting systems within or on any building or structure.
-delete- Section 301.3 exception (refer to Agency Natural Resources (ANR) regulations).
-delete and replace- Section 302.2 Industrial Wastes: Waste products from manufacturing or industrial operation introduced into the public sewer system are regulated by the Vermont Agency of Natural Resources.
-delete- Section 305.4.1 Sewer depth (refer to Agency Natural Resources (ANR) regulations)
-delete and replace- Section 311 Toilet Facilities for Workers: Toilet Facilities for Workers are regulated by the Vermont Department of Labor (VOSHA).
-delete and replace- Section 313.1 Equipment Efficiencies: Equipment efficiencies are regulated under the Commercial Building Energy Standards, as adopted by the Vermont Department of Public Service.
-add- Section 314.2.1.2 All condensate disposal shall conform to ANR regulations (802-828-1535).
-amend- Table 403.1 The minimum water closet and lavatory requirement for restaurants, banquet halls and food courts shall be in accordance with the Health Regulations for Food Service Establishments adopted by the Department of Health.
For access to Health Regulations for Food Establishments refer to; http://www.healthvermont.gov/about-us/laws-regulations/rules-and-regulations
-add- Section 403.1.1.1 Gender Free Restrooms and Required Fixture Counts: When a new gender free restroom is provided in an occupancy that has the total number of required plumbing fixtures set forth in the plumbing code and is fixed separately for both men and women, the fixtures in the new gender free restroom shall be deducted from the total required fixture count of either the men's or women's restrooms.
-add - Section 403.4.2 Single-user restroom signage: Single-user toilet facility/room shall be provided with a sign "RESTROOM". Signage for Accessible toilet facility/room shall comply with the Vermont Access Rules.
-delete and replace- Section 404 Accessible plumbing facilities: Accessible plumbing facilities and fixtures shall be provided in accordance with the Vermont Access Rules.
-amend- Section 412.1 Faucets and other fittings shall meet the most recent NSF/ANSI low lead standard (<0.25% weighted average lead content - wetted surface).
-delete - 412.10 Head Shampoo sink faucet. 2. A water heater conforming to ASSE 1082.
-add- Section 424.3 Waterless urinals: the installation of waterless urinals are permitted, subject to the prior approval of the Plumbers' Examining Board guidelines.
-add- Section 501.1.1 TEMPERATURE CONTROL FOR HOT WATER DISTRIBUTION SYSTEMS ONLY, additional downstream safety devices may be required.
Water heaters, tank style and tankless, shall be equipped with an ASSE 1017 Temperature actuated mixing valve in accordance with 602.2.
-amend- Section 501.2 Water heater as space heater. Where a combination potable water and space heating system requires water for space heating at temperatures higher than 120°F (49°C), a temperature actuated mixing valve complying with ASSE 1017 shall be provided to limit the water supplied to the potable hot water distribution system to a temperature of 120°F (49°C) or less. The potability of the water shall be maintained throughout the system.
-delete and replace- Section 501.6 Water temperature control in piping from tankless heaters: The temperature of water from tankless water heaters shall be a maximum 120°F (49°C) after the temperature actuated mixing valve when intended for domestic uses. This provision shall not supersede the requirement for protective shower valves in accordance with Section 412.3.
-add- Section 503.3 Water Heater Connections: All connections to the water heater including the ASSE 1017 temperature actuated mixing valve and the full port cold water shut off valve shall be rigidly supported using code compliant metallic piping. Metallic piping must extend a minimum of three feet or greater from both the hot and cold-water connection points.
-amend- Section 504.4 Relief Valve: Thermal expansion shall be controlled in accordance with Section 607.3
-delete and replace- Section 504.6.13 Material for Discharge Piping: Piping shall be constructed of metallic materials listed in section 605.4 or ASME 112.4.1.
-add- 504.6 (15) Outlet of all relief valve piping shall be cut on a 45-degree angle.
- delete and replace- 602.2 Potable water required: Only potable water shall be supplied to plumbing fixtures that provide water for drinking, bathing or culinary purposes, or for the processing of food, medical or pharmaceutical products. Unless otherwise required by law, potable water shall be supplied to all plumbing fixtures at a maximum temperature of 120°F (49°C).
-add- 602.3 Individual water supply systems are also regulated by Vermont Agency of Natural Resources. [Refer to page 15 for ANR info.]
-add in part- Section 602.3.4 Disinfection of system; After construction or major repair, the individual water supply system shall be purged of deleterious matter and disinfected in accordance with Section 610.
-amend- Section 603.2 Separation of water service and building sewer: Water service pipe and the building sewer shall be separated by 10 feet (3048 mm) of undisturbed or compacted earth.
-amend- Section 603.2 delete "not less than 12 inches (305 mm)" and replace with "not less than 18 inches (458 mm)".
-amend- Section 603.2 delete "at least 5 feet (1524 mm)" and replace with "at least 10 feet (3048 mm) from the sewer pipe centerline."
-amend- Table 604.3
Shower 2.0 at 8 psi
Shower, balanced pressure, thermostatic, or 2.0 at 20 psi Combination balanced pressure/thermostatic
Mixing valve
-add- Section 604.4 Exception 6. In new construction, low flow water closets with a flow rate of 1.28 gallons per flush as outlined in the Vermont Residential Energy Code may be used in lieu of the maximum flow rate of 1.6 gallons per flush as outlined in Table 604.4 of the International Plumbing Code.
-amend- Table 604.4
Lavatory, private 1.5 gpm at 60 psi Shower head 2.0 gpm at 80 psi Sink Faucet 1.8 gpm at 60 psi
-amend- Section 604.7 Inadequate water pressure: Water pressure booster systems are also regulated under the Vermont Water Supply Rules; chapter 21, as adopted by the Vermont agency of natural resources. [Refer to page 15 for ANR info.]
-amend- Table 605.3 Delete copper or copper-alloy tubing of types M and WM as approved material.
-amend- Table 605.4 Copper and copper-alloy tubing of types M and WM are restricted to above-grade use only.
-amend- Section 606.5 Water pressure booster systems: Water pressure booster systems are also regulated under the Vermont Public Water Supply Rules, as adopted by the Vermont Agency of Natural Resources. [Refer to page 15 for ANR info.]
-add - Section 607.5 Pipe Insulation; Install in accordance with VT Energy Standards. For additional information contact the
Vermont Energy Code Hotline at 855-877-0673 or https://publicservice.vermont.gov/content/building-energy-standards
-amend- Section 608.1 Plumbing under the scope of these rules shall also conform to the Vermont Water Supply Rules, as adopted by the Vermont Agency of Natural Resources, in regard to the prevention of cross-connections. [Refer to page 15 for ANR info.]
-add - 608.1.1 Installation of Backflow Assemblies shall be in accordance with ASSE Backflow Prevention Reference Manual or AWWA Backflow Prevention and Cross-connection Control: Recommended Practices M14.
-add- Section 608.9.1 - equivalent wording and signage acceptable to code official
-delete and replace- Section 608.18 Protection of individual water supplies: Individual water supplies are regulated by the Vermont Agency of Natural Resources.
-add- Section 610.1; or repaired
-delete and replace- Section 610.1(4) Repetition of Disinfection: The procedure shall be repeated where shown by a bacteriological examination that contamination remains present in the system. Consecutive bacteriological samples must be taken 24 hours apart before the water system is put back into service.
-amend - Section 612.1 Solar Systems: in accordance with the Vermont Plumbing Rules
-amend - Section 613.1 Temperature-actuated mixing valves. Temperature-actuated mixing valves are required to be installed to reduce water temperatures to defined limits. These valves shall comply with ASSE 1017 and are required to be installed at the hot water source.
-delete and replace- Section 701.2 Sewer required: Every building in which plumbing fixtures are installed shall be connected to a public or private sewerage system. Public and private sewerage systems are regulated by the Vermont Agency of Natural Resources.
-delete and replace- Section 701.4 Sewage Treatment: Sewage treatment is regulated by the Vermont Agency of Natural Resources.
-add- Section 701.8 Drainage piping in food service areas: Waste piping above any working, storage or eating surfaces in food service establishments shall be suitably protected to prevent contamination from leakage.
-delete- Section 702.2 Table - Polyethylene (PE) Plastic Pipe
-delete- Section 702.4 Table - Polyethylene (PE) Plastic Pipe
-delete- Section 702.7 Lead bends and traps.
-amend- Section 703.1 Building sewer pipe. Delete "installed within 5 feet (1524 mm) of the water service" & replace with "installed within 10 feet (3048 mm) of the water service."
-add - Section 704.5 Dead Ends: Drainage piping shall not be installed or altered that creates a dead-end section of piping. Cleanout extensions and piping for future fixtures shall not be considered as a dead-end.
-delete-Exception in Section 705.10.2
-delete and replace - Section 705.16.4 Plastic pipe or tubing to other piping material: Joints between different types of plastic pipe and/or other piping material shall be made with an approved adapter fitting. Joints between plastic pipe and cast-iron hub pipe shall be made by caulked joint or a mechanical compression joint.
-delete- 708.1.5 Cleanout Size - Exception (2)
-add- 803.3 Special Wastes System Design: Add "and shall conform to ANR regulations".
-delete and replace - Section 903.1.1: Roof Extension "All open vent pipes that extend through a roof shall be terminated at least 6" but not more than 12" above the roof."
-add- 903.1.1.1 Vent penetration through roof shall be protected against shear force.
-delete in part- 903.2 - not less than 1 foot (305mm)
-delete and replace- Section 904.3 Vent Termination: Vent stacks or stack vents shall terminate outside the building to the open air.
-add- Section 906.1 (.1) Size of stack vents and vent stacks: Every building shall have at least one 3-inch continuous stack vent or 3-inch continuous vent stack that extends to outside the building.
-add- Section 906.6 Horizontal branch vents: Horizontal branch vents within unheated areas shall be protected against freezing.
-add- Section 917.1.1 Single Stack Vent System: Single stack vent systems may not be used in single family homes. Single stack vent systems in all other occupancies may only to be used for engineered systems when approved by the plumbing inspector.
-delete and replace- Section 918.1 General. Air Admittance Valves: Vent systems utilizing air admittance valves for individual and branch-type air admittance valves shall conform to ASSE 1051. Stack-type air admittance valves are not permitted.
-amend- Section 918.3 Delete last sentence: Stack vents and vent stacks shall be permitted to terminate to stack-type air admittance valves in accordance with Section 918.3.2.
-delete- Section 918.3.2 Stacks.
-delete and replace- Section 918.7 Vent required: Within each plumbing system, a minimum of one continuous 3-inch stack vent or one continuous 3 inch vent stack shall extend outdoors to the open air.
-delete and replace - Section 1002.6 -Building Traps. Building house traps shall be prohibited, except where local conditions necessitate such traps. Building traps shall be provided with a clean-out and a relief vent of fresh air intake on the inlet side of the trap. The size of the relief vent or fresh air
intake shall not be less than one-half the diameter of the drain to which the relief vent or air intake connects. Such relief vent of fresh air intake shall be carried above grade and shall be terminated in a screened outlet located outside the building.
- add- Section 1003.1 Interceptors and Separators: External interceptors and separators located more than 10 feet from the building are regulated by the Agency of Natural Resources.
-delete - Section 1003.3.7 Gravity Grease Interceptors and gravity grease interceptors with fat oils and grease disposal systems. Refer to ANR Rules.
-delete and replace- Section 1101.2 Disposal. Storm drainage for a building roof or courtyard shall be regulated by this section. Storm drainage from paved areas, yards and courts are regulated by Agency of Natural Resources Watershed Management Division, stormwater program (802-828-1535).
-add in part- Section 1109.1 General: Where the public sewer is a combined system for both sanitary and storm water, the storm sewer shall be connected independently to the public sewer in accordance with Agency of Natural Resources Rules.
-delete and replace - Chapter 12 Special Piping and Storage Systems:
-add- Section 1301.1.1 Non-potable Water Systems: Contact Agency of Natural Resources Drinking Water and Groundwater Protection Division for prior approval.
-Delete - Chapter 14: Subsurface Graywater Soil Absorption Systems:
In the event any part or provision of these rules is held to be illegal, this shall not have the effect of making void or illegal any of the other parts or provisions of these rules.
These rules shall take effect [put in date here] Appendix (A). The Vermont Plumbing Law 26 V.S.A. Chapter 39.
For full text please refer to; https://legislature.vermont.gov/statutes/chapter/26/039
Appendix (B). Definition of Public Building - 20 V.S.A 2900(8).
-add- For full text refer to; https://legislature.vermont.gov/statutes/section/20/174/02900
Appendix (C). Procedure for Licensing Disciplinary Procedure.
The assistant attorney general, investigator, and licensee may present oral and written argument in addition to evidence, which also shall be made part of the record.
Where a licensee is not represented by counsel the board shall advise the licensee and aid in the examining and cross examining of witnesses as effectively as possible compatible with the impartial discharge of its duties as a body of impartial review.
If a board member is disqualified, thereby negating the quorum, the chair shall appoint a hearing officer to decide the matter in the same manner as if the board were presiding.
The Board promptly shall mail or deliver a copy of its decision to the licensee, the investigating panel and, if appropriate, to the complainant. An order attached to the judgment will go into effect after the end of the 30 day appeal period, if no appeal is filed.
Appendix (D). Asbestos.
The Vermont Department of Health regulates the removal of asbestos containing materials, as well as the training of persons who remove asbestos containing materials, in the Vermont Regulations for Asbestos Control. For additional information, contact the Vermont Department of Health, Division of Environmental Health (800-439-8550).
Appendix (E). Design of Grease Interceptor -- Reference 2018 Ipc Section 1003.
EXAMPLE
STEP 1- Determine the cubic content of the fixture by multiplying length X width X depth.
Example: A sink 48" long by 24" wide by 12" deep Cubic content 48 X 24 X12 = 13,824 cubic in.
STEP 2 - Determine the capacity in gallons, 1 gal= 231 cubic inches.
Example: Contents in gals 13,824 = 59.8 gals.
STEP 3 - Determine actual drainage load. The fixture is usually filled to about 75% of capacity with waste water, the items being washed displace about 25% of the fixture content. Actual drainage load = 75% of fixture capacity.
Example: Actual Drainage Load.75 X 59.8 gals= 44.9 gals.
STEP 4 - Determine the flow rate and the drainage period. In general, good practices dictate a one minute drainage period, however where conditions permit, a 2 minute period is acceptable. Drainage period is the actual time required to completely empty the fixture.
Flow Rate = Actual Drainage Load
Drainage Period
Example: Calculate flow rate for I minute period.
Flow Rate 44.9 Gals = 44.9 GPM
1 Min.
For 2 minute period
Flow Rate 44.9 Gals = 22.5 GPM
2 Min.
STEP 5 - Select the interceptor which corresponds to the flow rate calculated. Note --Select larger size when flow rate falls between two sizes listed.
As a general rule it is good practice to size the Interceptor so that it's rated capacity is never less than 40% of the fixture capacity in gallons. In the example above the actual fixture capacity is 59.8 gals., and 40% of this would be 23.9 gals. or a Fig. 8025. It is readily seen that a drainage period other than one or two minutes can be used. If conditions justify, any period between one and two minutes is satisfactory, however, we do not recommend a period longer than 2 minutes. Using the 40% rule of thumb gives a drainage period of 17/8 minutes.
28-007 Code Vt. R. 28-070-007-X
July 7, 1991 Secretary of State Rule Log #91-33 and #91-34
AMENDED:
November 1, 1996 Secretary of State Rule Log #96-62; February 1, 2005 Secretary of State Rule Log #05-01; December 2006 [Moved from Department of Labor and Industry]; December 15, 2010 Secretary of State Rule Log #10-043; July 1, 2013 Secretary of State Rule Log #13-016; August 1, 2015 Secretary of State Rule Log #15-029; July 15, 2019 Secretary of State Rule Log #19-029; 11/15/2022 Secretary of State Rule Log #22-029
STATUTORY AUTHORITY:
26 V.S.A. § 2173