Fixtures and Trap Sizes

Recommended trap sizes for different types of fixtures

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

trap size

Fixture Trap 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

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