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Toilet flush valve replacement
Difficulty: Easy · Time: 20–30 min · No plumber needed
Gather your tools
You'll need: adjustable wrench, sponge, bucket, replacement flapper kit (check your toilet model). Turn off the water supply valve behind the toilet — clockwise until it stops.
Drain & remove the old flapper
Flush to empty the tank. Use the sponge to remove remaining water. Unhook the rubber flapper from both pegs on the overflow tube, then disconnect the chain from the flush handle arm.
Inspect the flush valve seat
Run your finger around the valve seat (the hole the flapper sits on). If you feel mineral buildup or pitting, clean it with white vinegar on a cloth. Rough edges prevent a watertight seal.
Install the new flapper
Snap the new flapper onto the overflow tube pegs. The tabs should click firmly into place. Connect the chain to the flush arm — leave 1/2 inch of slack. Too tight = leaks. Too loose = poor flush.
Restore water & test
Turn the supply valve counterclockwise to restore water. Wait 60 seconds for the tank to fill. Add a few drops of food coloring to the tank — if color appears in the bowl without flushing, the flapper needs adjustment.
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