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
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

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