53 Pa. Stat. § 4629
Number of Traps Permitted on Various Size Waste Pipes. | |||
1-1 1/4 Trap | permitted on 1 1/4 | Waste Pipe. | |
2-1 1/2 ", | or equivalent, | permitted on 1 1/2 | " ". |
3 to 8-1 1/2 ", | " ", | " " 2 | " ". |
9 to 20-1 1/2 ", | " ", | " " 2 1/2 | " ". |
21 to 44-1 1/2 Trap, | or equivalent, | permitted on 3 | Waste Pipe. |
If building is ten (10) or more stories in height, the vertical waste-pipe shall not be less than three (3) inches in diameter. The use of short pattern recessed drainage fittings or wrought-iron, steel or copperized pipe for waste-pipe two inches or less in diameter is prohibited.
The size of traps and waste branches, for a given fixture, shall be as follows:--
Kind of Fixtures. | Size in inches. | |
Trap. | Branch. | |
Water-closet, | 3 | 4 3 |
Slop sink with trap combined, | 3 | 3 |
Slop sink ordinary, | 2 | 2 |
Pedestal urinal, | 3 | 3 |
Stall urinals, | 2-4 | 2-4 |
Wall urinals, | 1 1/2.2.3 | 2.3 |
Floor drain or wash, | 3.4 | 3.4 |
Yard drain or catch basin, | 4 | 4 |
Laundry trays (2 or 5), | 1 1/2.2 | 2 |
Combination sink and tray (for each fixture), | 1 1/2 | 2 |
Kitchen sinks (small) for dwellings, | 1 1/2 | 1 1/2 |
Kitchen sinks (large), hotels, restaurants, grease trap, | 2 | 2 |
Pantry sinks, | 1 1/2 | 1 1/2 |
Wash basin, one only, | 1 1/4 | 1 1/4 |
Bath tubs 4x8 inches, drum trap, | 1 1/2 | |
P. or Running trap, | 1 1/2 | 1 1/2 |
Shower baths over bath tub, | 1 1/2 | 1 1/2 |
Shower baths (floor), | 2 | 2 |
Sitz baths, | 1 1/2 | 1 1/2 |
Drinking fountains, | 1 1/4 | 1 1/4 |
Dental Cuspidor 4x8, Drum, P or Running trap, | 1 1/2 | 1 1/2 |
Dish Washers motor driven, | 2 | 2 |
53 P.S. § 4629