Fixtures and Trap Sizes

Recommended trap sizes for different types of fixtures

Recommended trap sizes for different types of fixtures can be found in the table below.

trap size

FixtureTrap Size
(in)
Bathtub 1 1/2
Bidet 1 1/2
Dishwasher 1 1/2
Drinking fountain 1 1/4
Floor drain 2
Kitchen sink 1 1/2
Laundry tub 1 1/2
Lavatory 1 1/4
Public toilet integrated in the fixture
Shower 2
Toilet integrated in the fixture
Urinal 2
Washing machine 2

Related Topics

  • Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more

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