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How To Fix a Toilet That Won't Flush

If your toilet won't flush, chances are you need a new flush valve. With a few simple steps you can install a new flush valve and ensure your toilet flushes the way it's supposed to.


  • Step 1: Tighten the nut at the underside of the tank if there is any leakage after the water is turned on, and make sure the nut isn't cross-threaded.
  • Step 2: Adjust the water level. Your toilet should now flush all the way with just a push of the handle.
  • FACT: Dentists have recommended that toothbrushes be kept at least 6 feet away from a toilet to avoid airborne particles resulting from the flush.
  • Step 3: Insert the new refill tube into the overflow pipe, reconnect the supply line, and turn the water back on.
  • TIP: Do not over tighten the nuts -- you risk cracking the toilet tank.
  • Step 4: Use the adjustable wrench to disconnect the supply line where it enters the toilet tank. Allow the water left in the tank to drain into the bucket.
  • Step 5: Hold the lock nut at the base of the ball cock or fill the valve with pliers while you loosen the nut on the underside of the toilet tank with the wrench. Then unscrew the nut and pull the old assembly out of the tank.
  • Step 6: Clean the opening in the tank where the assembly was with a scrubbing pad and insert the new assembly, making sure the conical washer of the new assembly is centered over the hole. Then, again holding the lock nut inside of the tank with pliers, tighten the nut beneath the toilet tank.
  • Step 7: Turn off the water supply to the toilet and flush. Remove the cover from the toilet tank and place a small bucket beneath the supply line.

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