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Trap Size vs. Fixture Units

No. of fixture units and required trap size.

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Maximum no. of fixture units and required trap sizes:

Sanitary Trap Sizes vs. Fixture Units
No. of Fixture UnitsTrap Size
1 1 1/4
2 - 3 1 1/2
3 - 4 2
5 - 6 3
6 - 8 4
  • 1 ib = 25.4 mm
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