Replacing a Toilet Water-Supply Pipe
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Replacing a Toilet Water-Supply Pipe

A homeowner's guide to replacing a toilet's water supply pipe.

Replacing a leaking toilet water-supply pipe saves water and prevents water-caused damage to the bathroom's flooring and drywall. Over time corrosion weakens the water-supply pipe and its seals or gaskets, causing leaks to form in the weakened areas. What starts off as a pinhole leak eventually turns into a gushing mess. In some cases tightening the supply pipe's fitting will temporarily solve the problem, however, damage usually has already occurred internally and the leak will reappear in a mater of days. Replacing the toilet water-supply pipe solves the problem for many years, instead of days.

1) Turn the toilet's water-supply valve off. A cold-water-supply pipe enters the bathroom behind the toilet, usually through the bathroom wall. The toilet's water-supply valve attaches to the end of this pipe. Older valves often start to leak when they haven't been used in a long time. If the valve starts to leak, place a wrench on the valve's body and tighten the compression nut holding the valve's handle against the valve body. Never turn the compression nut without holding the valve body still with an additional wrench.

2) Flush the toilet, draining the water from the toilet tank. Remove the toilet tank lid. Hold down the tank handle, reach into the tank and direct as much of the water leftover on the bottom of the tank toward the tank's drain as possible. If water continues to fill the tank, then the water supply valve has failed. If the water-supply valve has failed, turn the water to the house off at the main water valve, which is found outside where the main water pipe enters the home.

3) Set a bowl on the bathroom's floor underneath the toilet's water-supply valve.

4) Hold the toilet's water-supply valve still with the wrench and loosen the nut holding the toilet water-supply pipe to the valve with a second wrench. Catch the residual water in the water-supply pipe in the bowl. Remove the water-supply pipe from the valve.

5) Remove the nut holding the water-supply pipe to the toilet's flush valve, located underneath the toilet tank.

6) Clean the male threads on the water-supply pipe and the male threads on the flush valve with a rag.

7) Buy a new toilet water-supply pipe that matches the length of thew old pipe. Usually a flexible fiber-reinforced vinyl toilet supply pipe is the best option when buying replacement toilet supply pipes. Its flexible nature allows it to connect between offsetting fixtures without the need to use a pipe bender. Each end of this type of replacement pipe contains a rubber washer that prevents leaks. Metal-reinforced flexible toilet supply pipes cost a lot when compared to the vinyl pipes. Chrome-plated brass toilet supply pipes often require a pipe bender to make the alignment bends.

8) Position the end of the new toilet water supply on the flush valve's threaded end. Hand tighten the supply pipe's nut. The supply pipe's nut contains a rubber washer that tightens against the end of the flush valve's threaded fitting.

9) Position the remaining end of the toilet water-supply pipe on the water valve's threaded fitting. Hand tighten the supply pipe's nut. Place a wrench on the water valve and turn the supply pipe's nut one full turn with the second wrench.

10 ) Turn the toilet's water-supply valve on. Allow the tank to fill and check the water-supply pipe's fittings for leaks. Tighten any leaking fittings as needed.

Replacing a leaking toilet water-supply pipe yourself eliminates the need to call a plumber and saves the expense involved. Most homeowners can complete this repair on the first attempt without leaks. If the water-supply pipe does leak, simply tightening the leaking fitting solves the problem.

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Comments (1)

Very useful information