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HeyBub[_3_] HeyBub[_3_] is offline
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Default LEAK in wall? (Was: new valve stems - unequal water pressure)

wrote:

I am really not getting the connection between draining the h/w tank
or even replacing the valve stems and this break. Guess I'll find out
when I get a plumber out here.


Rare, but not unheard of:

Turning the main valve on rather quickly puts a pressure surge in the pipes.
If a joint or section of pipe was fragile, this sudden surge could cause a
failure.