YooperPhil
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I'm putting in a new bathtub and moving everything a short distance in a second floor bathroom. When I opened up the wall, I found that the hot and cold water pipes have a short branch to the side where they merge into a single pipe with a valve that I'm guessing let's you set the proportion coming from each pipe. That valve was currently set right in the middle. I don't know where it goes, and I can't for the life of me imagine what it's for. But maybe it explains another riddle. In a couple of my sinks and the tub, I notice that when I first turn the cold water on, I get hot water for about a minute, then cold. Is that valve letting them mix? Should I just leave it as is, since I don't know what it's for, or turn it to one extreme position, or get rid of it. What's your take?