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Hot water getting into cold water lines.

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I have an issue with hot water getting into the cold water lines. And also the hot water not staying hot enough for it to fill up bath.
I just installed 2 delta rough in shower valves. And then the problem started.
Could it be the thermostat just went out same timing or did I not plumb it right?
 

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Twowaxhack

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You need to install the cartridge if the rough valve didn’t come with a white piece about 3” long with two o rings on one end.,,,..that’s a delta rough valve plug.

some delta rough valves come with it.
Or cut you in a stop valve in one of the hot or cold feed lines then leave it off until you get the cartridge installed.
 

Twowaxhack

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The blue plastic plug you have screwed into the shower head outlet. It looks used......have you ever did a job like this before ?
 
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