How to Replace a Toilet Shut-Off Valve

 How to Replace a Toilet Shut-Off Valve


That inconspicuous toilet shut-off valve doesn’t see much action. In fact, that valve may sit for years without ever being closed. That’s not a good thing. After going unused for so long, the valve’s rubber washers begin to dry rot so that when you finally give it a turn, it leaks. And since the valve is usually only closed when the toilet isn’t working, a leaking shut-off valve often adds insult to a repair that’s already in progress.

This guide shares how to replace a toilet shut-off valve to get that leak fixed and your porcelain throne back in service as soon as possible.

Tools & Materials

Before You Begin

Replace a Toilet Shut-Off Valve: Inspecting the Pipes


It’s vital to assess the type of plumbing you have before getting started with a toilet shut-off valve replacement.

  • If you live in a home built before 1980, chances are you have iron pipes. Corroded iron pipes can break and crumble when you attempt to remove an old shut-off valve, turning what was supposed to be an easy repair project into a DIY nightmare. For that reason, it’s best to hire a professional if you’re dealing with old cast iron plumbing.
  • You may also encounter copper plumbing. Copper pipes are often joined to toilet shut-off valves through a process called sweating, which involves soldering the joint with a blowtorch. This isn’t necessarily an obstacle for DIYers. You can easily cut a sweated copper joint and replace it with a compression connection, avoiding the need to wield high-intensity…

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