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How to replace a fill valve


Step 1. Toilet fill valves degrade eventually and need to be replaced. Before removing the old fill valve, shut off the water supply at the fixture stop valve located on the tube that supplies water to the tank. Flush the toilet and sponge out the remaining water. Then, remove the old fill valve assembly by loosening and removing the mounting nut on the outside of the tank wall that secures the fill valve.

 

Step 2. Fill valves need to be coordinated with the flush valve so the tank water level is not higher than the overflow pipe and so the fill valve is not low enough in the tank that it creates a siphoning hazard. New fill valves have a “critical level” mark (“CL”) near the top of the valve.

 

Step 3. The new fill valve must be installed so the Critical Level (“CL’) mark is at least 1” above the overflow pipe. Slip the shank washer on the threaded shank of the new fill valve and place the valve in the hole so the washer is flat on the tank bottom. Compare the locations of the CL mark and the overflow pipe.

 

Step 4. Adjust the height of the fill valve shank so the “CL” line and overflow pipe will be correctly related. Different products are adjusted in different ways--the fill valve shown here telescopes when it’s twisted.

 

 

 

 

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