Here is what I've installed.
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Here is what leaks. It's Blue Monster Pipe Thread Sealant.
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Only the hot water "in" leaks. but I'm assuming this is not how it's done. I should have probably soldered the fittings after tightening them the best I could?
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If soldering this close to the plastic workings inside do I remove them like I did for the mixing valve?

Any help/scrutiny/criticism is welcome and much appreciated.