1. Fixtures that have integral traps.
2. A single trap shall be permitted to serve two or three like fixtures limited to kitchen sinks, laundry tubs and lavatories. Such fixtures shall be adjacent to each other and located in the same room with a continuous waste arrangement. The trap shall be installed at the center fixture where three fixtures are installed. Common trapped fixture outlets shall be not more than 30 inches (762 mm) apart.
3. Connection of a laundry tray waste line into a standpipe for the automatic clothes-washer drain shall be permitted in accordance with Section P2706.1.2.1.
TABLE P3201.7 SIZE OF TRAPS FOR PLUMBING FIXTURES
|PLUMBING FIXTURE|| TRAP SIZE |
| Bathtub (with or without shower head and/or |
|Clothes washer standpipe||2|
|Dishwasher (on separate trap)||11/2|
| Kitchen sink (one or two traps, with or |
without dishwasher and food waste disposer)
|Laundry tub (one or more compartments)||11/2|
| Shower (based on the total flow rate through |
showerheads and bodysprays)
|5.7 gpm and less||11/2|
|More than 5.7 gpm up to 12.3 gpm||2|
|More than 12.3 gpm up to 25.8 gpm||3|
|More than 25.8 gpm up to 55.6 gpm||4|