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Is a shut off valve in-line on a supply line to a plumbing fixture acceptable?
Wednesday, July 11, 2018
“I don’t like inline shut off valves,” says our plumber friend James Freeman, “because if the supply line leaks before the valve you have to shut down the water to the whole house until it gets repaired.” We agree with James and, because a supply line has a shorter lifespan rating than pipe, odds are it will leak first.
The plumbing code requires a shut off valve within sight for each supply pipe to each fixture. Because the code does not spell out that it has to be on the pipe before the supply line, a municipal inspector might let an inline valve slide. But we doubt it.
The in-line shut off valve shown above was in the bathroom of a 1950s house we inspected yesterday. Original galvanized steel water supply pipe had been mostly replaced, except at the risers inside the walls to the bathroom. As it turned out, there already was corrosion and leakage beginning at the pipe-to-supply-line connection at the wall at one location, as shown in the photo below; and, as James predicted, they will have to turn off the water to whole house to fix it.
Also, see our blog post Which plumbing fixtures require water shut off valves in a home?
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