Section SPS 382.32 - Traps and direct fixture connections(1) SCOPE. The provisions of this section set forth the requirements for the types and installation of traps and direct fixture connections.(2) MATERIALS. All traps and fixture connections shall be of approved materials in accordance with ch. SPS 384.(3) GENERAL. Each plumbing fixture, each compartment of a plumbing fixture and each floor drain shall be separately trapped by a water seal trap, except as provided in par. (a) or as otherwise permitted by this chapter. A fixture shall not be double trapped. (a)Trap exceptions. The plumbing fixtures listed in subds. 1. to 3. shall not be required to be separately trapped: 1. Fixtures having integral traps;2. Compartments of a combination plumbing fixture installed on one trap, provided: a. No compartment is more than 6" deeper than any other;b. The distance between the compartments' waste outlets farthest apart does not exceed 30"; andc. No compartment waste outlet is equipped with a food waste grinder.3. Storm drains as provided in s. SPS 382.36 (12) (a). Note: Residential exclusion see s. SPS 325.01 (4) (a).
(b)Trap seals. Each trap shall provide a liquid seal depth of not less than 2" and not more than 4", except as otherwise specified in this chapter.(c)Loss of trap seal. A trap seal primer valve may be installed on a trap subject to high rates of evaporation. 1. A trap seal primer valve or other means of trap seal protection acceptable to the department shall be provided for a trap subject to seal loss due to evaporation. Note: Liquids acceptable to use for reducing trap seal evaporation include mineral oil, vegetable oil, propylene glycol and glycerin.
2. Trap seal primer valves shall conform to ASSE 1018 or ASSE 1044. Note: A list of referenced standards is contained in ch. SPS 381.
3. Barrier type trap seal protectors for floor drains shall conform to ASSE 1072.(d)Design. Traps shall be self-scouring and shall not have interior partitions, except where such traps are integral with the fixture. Uniform diameter P-traps shall be considered self-scouring.(e)Size.1. Except as provided in subd. 2., traps shall be of diameters not less than those specified in Table 382.30-1.2. The minimum trap diameter for a trap serving a shower replacing a non-public residential-type bathtub is 1.5 inches provided each of the following apply: a. The shower shall have no more than one control valve and not allow for the operation of more than one showerhead simultaneously.b. It shall be permissible under this approval to use a diverter valve that feeds up to 2 showerheads provided the showerheads cannot be used simultaneously.c. The showerhead shall have a maximum flow rate of 2.5 gallons per minute.(f)Prohibited traps. The installation of the types of traps listed in subds. 1. to 6. shall be prohibited: 2. Drum traps, except where specifically approved by the department;3. S-traps which are not integral parts of fixtures;4. Separate fixture traps which depend on interior partitions for the trap seal;5. Traps which depend upon moving parts to maintain the trap seal; and6. Traps which in case of defect would allow the passage of sewer air.(4) INSTALLATION. (a)Setting of traps. All traps shall be rigidly supported and set true with respect to the water level and so located as to protect the water seals, and shall be protected from freezing and evaporation.(b)Distance from fixture drain outlets.1. 'Vertical distance.' Except as provided in subd. 1. a. to c., the vertical distance between the top of the fixture drain outlet and the horizontal center line of the trap outlet shall not exceed 15". a. The vertical distance between the top of the strainer of a floor drain or the opening of a standpipe receptor and the horizontal center line of the trap outlet shall not exceed 36".b. The vertical distance between the top of the fixture drain outlet of a pedestal fixture or a cuspidor and the horizontal center line of the trap outlet shall not exceed 60".c. The vertical distance between the water level in the bowl of a floor outlet water closet or floor outlet clinic sink and the center line of the horizontal portion of the fixture drain may not exceed 36 inches.d. The vertical distance from the inlet to the horizontal centerline of the fixture drain for a campsite receptor, exterior storm drain inlet, or a receptor for a sanitary dump station may exceed 3 feet so as to permit the trap to be installed below the predicted depth of frost.e. The vertical distance of a floor outlet fixture between the top of the fixture drain outlet and the horizontal center line of the trap outlet may not exceed 18 inches.2. 'Horizontal distance.' Except as provided in subd. 2. a. and b., the horizontal distance between the vertical centerline of a fixture drain outlet and the vertical centerline of the trap inlet shall not exceed 15". a. The horizontal distance for a pedestal drinking fountain shall not exceed 24".b. The horizontal distance for an exterior sanitary area drain or a residential garage floor drain discharging through an interior trap shall not exceed 25 feet.c. The minimum horizontal distance between the vertical centerline of the outlet from a floor-mounted water closet and a 3-inch double tee shall be 30 inches. Note: See ch. SPS 382 Appendix for further explanatory material.
(5) DIRECT FIXTURE DRAIN CONNECTION. Except as provided in s. SPS 382.33, all plumbing fixtures and appliances discharging wastes shall connect directly to a drain system. (a)Floor drains.1. Floor drains shall be so located as to be accessible for cleaning purposes.2. A floor drain receiving the wash from garbage cans shall be at least 3" in diameter.(b)Kitchen sinks. Horizontal drain piping serving a kitchen sink trap shall not connect to vertical drain piping by means of a double sanitary tee where an appliance with pump discharge or a food waste grinder are installed.(c)Water closets. A water closet shall discharge through a drain pipe or fitting with a minimum diameter of 3".1. A floor mounted wall outlet water closet shall connect to a 4 inch or 4 X 3 inch closet collar fitting or to a horizontal or vertical carrier type fitting.2. A floor outlet water closet shall connect to a 4 inch or 4 X 3 inch closet collar fitting.3. A wall mounted wall outlet water closet shall connect to a horizontal or vertical carrier type fitting.4. Two water closets discharging to a vertical drain from opposite sides by means of the same fitting shall be installed in accordance with subd. 4. a. and b. a. Where the vertical drain is 3" in diameter, the fitting for floor outlet water closets shall be a 3 inch double wye pattern fitting.b. Where the water closets are wall outlet types the fitting shall be a double wye pattern fitting or a carrier-type fitting.(d)Blowout-type fixtures. Blowout-type plumbing fixtures shall be installed in accordance with the approval of the department.Wis. Admin. Code Department of Safety and Professional Services § SPS 382.32
Cr. Register, February, 1985, No. 350, eff. 3-1-85; am. (4) (a), cr. (5) (intro.) and (d), Register, May, 1988, No. 389, eff. 6-1-88; am. (4) (b) 1. b., Register, April, 2000, No. 532, eff. 7-1-00; CR 02-002: r. and recr. (3) (c) 1. and (4) (b) 2., am. (4) (b) 1. b., cr. (4) (b) 1. d., Register April 2003 No. 568, eff. 5-1-03; CR 02-129: am. (3) (intro.) Register January 2004 No. 577, eff. 2-1-04; CR 04-035: am. (3) (a) 3. Register November 2004 No. 587, eff. 12-1-04; CR 08-055: cr. (4) (b) 2. c. Register February 2009 No. 638, eff. 3-1-09; correction in (2), (3) (a) 3., (e), (5) (intro.) made under s. 13.92(4) (b) 7, Stats., Register December 2011 No. 672.Amended by, correction in (3)(a) (Note) made under s. 13.92(4) (b) 7, Stats., Register December 2015 No. 720, eff.1/1/2016Amended by, CR 23-006: am. (3) (c) 2., cr. (3) (c) 3., renum. (3) (e) to (3) (e) 1. and am., cr. (3) (e) 2., am. (4) (b) 1., c., cr. (4) (b) 1. e., am. (5) (b), (c) 2. Register September 2023 No. 813, eff. 10/1/2023