There is a leak we can't find. Replaced
float assembly and flapper. It's a slow
leak. With the supply cut off at the wall,
it leaks down to below the flapper.
How is the standpipe (overflow) removed
for replacement? Is there a large nut
accessible only when the tank is removed?
Could the leak be stopped with Tub & Tile
Caulk around the very bottom of the pipe?
The overflow tube is part of the flush valve assy.
Although it does screw into the flush valve casting, it is
very unlikely that the threads are leaking.
The flush valve can only be removed by taking the tank
off the bowl. Then, there is a large nut under the tank.
There is a gasket between the flush valve and the upper
side of the tank. Rare, but possible that the gasket is
leaking and allowing water to run past the big threads
and into the bowl.
As an experiment, try sealing the flapper to the seat (caulk?).
If still leaks, guess you'll have to pull the tank.
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