How to Replace a Water Supply Valve


Replacing your water supply valve can be tricky at times. We will try to take some of the mystery out of it. It is easy if you know what you are doing, but if you are a novice do read this. It will help you to change the valve without any pain.

Things You'll Need

  • A Replacement Valve
  • Washers
  • Some Plumbing Tape
  • Gloves
  • Adjustable Wrench
  • A Screwdriver
  • A Rag
  • Buying the correct size of valve is important. Valves come in different sizes so measure before buying. It will save you a trip to the hardware store. Tell the clerk what you are doing and give them the measurements. Let them suggest what to get.

  • Back at the house you need to turn the main off to your water supply. You do not want water to be wasted and more importantly go everywhere when you are replacing your old valve. It will generally be out of the house at the side or at the back.

  • Removing the old valve can take some time. Wear your gardening or other gloves before you attempt it. There may be corrosion and deposits that hinder you. Use the screwdriver to remove any deposits that may be in the way. Then try and unscrew the whole valve from the pipe with the adjustable wrench.

  • Clean the area thoroughly with the rag once you have successfully removed the valve. The deposits may have covered the threads of the valve and while it is open you want to take advantage and clean. Once you have cleaned the area you are ready for the next step.

  • Replacing the new valve will be easier than taking the old one off. It should go in easier because the threads are clean. Turn the new valve in place after putting in the new washers and some plumbing tape. The washers and the plumbing tape will help with any leaks.

  • Turn the water back on. Make sure there are no leaks where you put the new valve. If there are any turn the water off and open it to check the leak. Put some more plumbing tape if required. Plumbing tape stops leaks as it is waterproof.

  • Put your tools back and throw away the old valve. The gloves go back to where they belong and so does the rag. Give yourself a pat on the back as you have accomplished a new task today, and you should be proud.

Tips & Warnings

  • As they say in the tailoring world, measure twice before you cut once, that should be true to the plumbing too. Measure everything right before you buy.
  • Two things to be careful about, one is that the main water is off and secondly be careful of nicks and cuts. They can happen when you replace anything.

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