Find the cause
- Take the tank lid off and watch a flush.
- If water runs into the overflow tube, the fill level is too high or the fill valve is worn.
- If water leaks past the flapper, it needs replacing.
- If the chain is tangled or too short, adjust it.
Replacing a flapper
Shut the little valve at the wall, flush once to drain the tank, pop off the worn flapper and clip on a matching replacement. Leave just a bit of play in the chain.
Replacing a fill valve
Close the supply, empty the tank and sponge out the rest. Disconnect the supply line, remove the old valve and install the new one, setting its height to match the tank.
When to call
If the tank is cracked, the bolts are leaking or the parts are unusual, call for help.
Still hissing with a brand new flapper fitted? the flush valve seat may be pitted. Running a fingertip around the seat will tell you; a rough seat needs a repair kit or a new valve.
Rather hand it over? Our plumbers handle water service line replacement and shower valve repair along with everything else on our residential plumbing list.