Bad Y Valve
Several years ago I put a brass Y at an outside faucet to go in 2 directions... I have a heater wire that I plug in during the winter so the water line going into my wife's greenhouse won't freeze, and the wire is wrapped partially around the faucet and the Y valve, and covered in foam insulation, so there has never been a problem in the winter with anything freezing
.
A few days ago one of the fittings suddenly started leaking... a new gasket did not fix the problem... during testing I turned the Y over so the leaking fitting was now on the top... and it leaked while the one that was switched to the bottom did not leak... the rim where the gasket goes is still smooth, so I am sure the problem is a crack in the thread area... I bought a new Y and nothing leaks... I can't see anything (no magnifying glass) but there is clearly a crack hidden somewhere in the thread area that is letting water out
.
Has anyone ever heard of a brass valve cracking... in the summer?


