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P3201.7 Size of Fixture Traps
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Trap sizes for plumbing fixtures shall be as indicated in Table P3201.7. Where the tailpiece of a plumbing fixture is larger than that indicated in Table P3201.7, the trap size shall be the same nominal size as the fixture tailpiece. A trap shall not be larger than the drainage pipe into which the trap discharges.
SIZE OF TRAPS FOR PLUMBING FIXTURES
| PLUMBING FIXTURE | TRAP SIZE MINIMUM (inches) |
| Bathtub (with or without shower head and/or whirlpool attachments) | 11/2 |
| Bidet | 11/4 |
| Clothes washer standpipe | 2 |
| Dishwasher (on separate trap) | 11/2 |
| Floor drain | 2 |
| Kitchen sink (one or two traps, with or without dishwasher and food waste disposer) | 11/2 |
| Laundry tub (one or more compartments) | 11/2 |
| Lavatory | 11/4 |
| Shower (based on the total flow rate through showerheads and bodysprays) Flow rate: 5.7 gpm and less More than 5.7 gpm up to 12.3 gpm More than 12.3 gpm up to 25.8 gpm More than 25.8 gpm up to 55.6 gpm | 11/2 2 34 |
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.
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