P3201.7 Size of Fixture Traps
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.
|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)
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
For SI: 1 inch = 25.4 mm, 1 gallon per minute = 3.785 L/m.