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When water is heated, pressure builds up in the tank. If this pressure is too great, a rupture could occur. A pressure-relief valve serves as a check valve to automatically open and relieve the pressure. Most water heaters now come with one, but if yours doesn't, you'll have to install one, and occasionally they need to be replaced. Consult your local home center to find the valve that will fit your water heater.
Prepare the Fitting Threads
Wrap the threads of the pressure-relief valve clockwise with Teflon tape or apply piping compound.
Attach the Valve to the Water Heater
Use a pipe wrench or an adjustable wrench to connect the relief valve to the opening in the water heater. Measure the distance from the relief valve to the floor. Cut lengths of CPVC pipe to match the ones you're replacing, as long as they extend to within 3 inches of the floor. Connect the pipe and elbow to the pressure-relief valve.
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