Observed arrival · 2026-09-01
FixtureUnit turns plumbing code tables into a working reference
A practical plumbing reference that maps fixture units to pipe sizes, explains venting and material choices, and estimates whole-house repipe costs.
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The homepage groups the reference by the quantities plumbers actually size: WSFU for supply lines, DFU for drains, pressure loss, venting, and material-specific comparisons. Its examples range from ½-inch PEX pressure loss at 2 GPM to building-drain questions for different bathroom configurations. A separate repipe section indexes 1,494 city-level calculations, including a state-by-state estimate for a 12-fixture house.
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○OpenPublic substance visible
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