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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

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

1 in = 25.4 mm

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Related Topics

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

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