Leak near Valve/Tank Connection
I have an occasional/slow leak at the Tank/Valve connection. This is the black tank, and it seems like the pressure vent is not releasing pressure, as this only happens whilst the tank is 3/4 full and...
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His piping leaks, the level of chit in the tank is immaterial (as is the size of the vent). There is no “pressure vent”. There is only a vent. If his tank was “pressurized”, he would certainly be well aware of that fact every time he flushed the toilet - he would get a rude face wash.
