How to Remove a Flush Valve


A flush valve that has leaks or does not seal to the tank after flushing requires replacement. Unlike the fill valve, removing the flush valve involves disconnecting the toilet tank from the bowl. The flush valve uses a securing nut on the bottom of the toilet tank that also has a rubber grommet around it to help seal the tank. Take the old flush valve to a home improvement center to purchase one that is similar in design.

Things You'll Need

  • Towels
  • Wrench
  • Socket wrench
  • Flat-head screwdriver
  • Pipe wrench
  • Locate and turn off the water supply valve to the toilet tank. The shut-off valve is behind the toilet on the incoming house water pipe. Turn the oblong valve handle clockwise to shut off the water.

  • Lift the lid off the toilet tank and set it on a flat surface. Flush the toilet, and hold down the flush lever to allow as much water as possible to drain through the flush valve. Soak up the remaining water inside the tank with towels.

  • Disconnect the water supply line from the bottom of the fill valve. The supply line connects to the exposed threaded portion of the fill valve like a garden hose. Turn the connection nut counterclockwise with a wrench.

  • Unhook the flapper chain from the end of the flush lever, if your flush valve uses a flapper. Disconnect the fill tube from the top of the flush valve. The fill tube is the small water line from the fill valve that clips onto the flush valve. Simply lift the clip off the flush valve to remove the tube.

  • Remove the two nuts securing the toilet tank to the rear of the toilet bowl with a socket wrench. The nuts thread onto the tank bolts under the toilet flange. If necessary, hold the head of each bolt inside the toilet tank with a flathead screwdriver to keep the bolts from turning with the nuts.

  • Grab the toilet tank at each side with your hands and lift it off the toilet bowl. Place the tank upside down on the floor. Pull the rubber grommet off the end of the flush valve. Remove the locking nut securing the flush valve to the tank with a pipe wrench.

  • Place the tank on its side, and pull the flush valve out of the tank. Do not place the tank on its bottom because you could damage the exposed threads of the fill valve.

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