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Fixtures and Trap Sizes

Recommended drain trap sizes for different types of fixtures

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Recommended drain trap size for different types of fixtures:

Fixture drain - 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
  • 1 in = 25.4 mm
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  • en: drain sewer fixture trap sizes pipe
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