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Replacing A Toilet Fill Valve


Anti-siphon toilet fill valve
Aaron Stickley
There are quite a few valve selections when it comes to replacing a toilet fill valve. The shortest fill valve on the market has to be the little adjustable anti-siphon toilet fill valve. This valve design has been around for a long time but I am such a fan of Fluidmaster fill valves that I rarely use anything else. Still, I have heard many people talk about using this small valve so I decided to give the design a try. This valve design is manufactured by Plumb Pack, Waxma, and Keeney among others and they are easy to find in local home improvement stores. Replacing a toilet fill valve with this inexpensive valve was quick and easy.

  1. Shut off the water to the toilet. You should be able to shut off the water under the toilet or at the main shut off valve to the house. Check to see if the water is off by flushing the toilet and making sure it does not refill. Empty all the water you can out of the tank by holding down the handle.

  2. Remove the old valve. Either sponge out the water or put some kind of container under the old fill valve to catch the water when you remove the valve. Disconnect the water supply line by unscrewing it by hand or with pliers. Next loosen the nut that secures the fill valve in place. This should come off easily if you remember to turn it counter clockwise. Turning it the right direction can get confusing when you are doing it from underneath. With the nut disconnected pull out the old fill valve and the rest of the water will drain out of the toilet tank.

  3. Install the new fill valve by removing everything except the rubber washer that is closest to the main housing. Now set the new fill valve in place from the inside of the tank and tighten it with the plastic nut from underneath the toilet tank. The directions on the valve packaging say to tighten it hand tight, but I like to go a ¼ turn extra with pliers after hand tight to make sure I do not have any leaks. Note: Over tightening can result in a cracked tank so do not over tighten.

  4. Connect the fill tube. Attach the refill tube onto the fill valve which should just push on easily. Then attach the other end of the refill tube onto the flush valve overflow pipe with the clip.

  5. Connect the water supply. Reconnect the water line to the toilet tank. This should be done hand tight and rarely requires pliers because the wings on the nut make it easy to turn. If the nut is not easy to turn it may require a small turn with pliers.

  6. Adjust the water level. Turn the water on to the unit. Check and see where the water level stops. You want the water to stop at the recommended water line that is marked on the inside of the toilet tank or about 1” from the top of the overflow pipe if there is no mark. You can adjust the water level up by turning the adjustment knob clockwise. About one full turn results in about 2” of extra water. By turning the fill valve counter clockwise the water level will adjust down.

That is all there is to replacing a toilet fill valve with this simple anti-siphon toilet fill valve. I had no problems with the installation or any adjustments. The installation took less that 15 minutes total (including taking pictures at every step). I will be monitoring this fill valve and give any updates if I encounter any problems.

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