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We have something partially plugging the Cold Water in our house, we have low pressure there, but only in the house, it is fine outside, so we know it is something in the line. Just have not gotten around to tracking it down yet......
I redid a friend's shower, and since the plumbing wasn't bad, I decided to leave it undisturbed...But, they had very little water pressure at the head...I took the valve apart and dicovered small pieces of teflon tape, blocking the flow.
After some detective work, I realized that this is probably a common problem with people who use teflon tape...In wrapping a joint, if you allow the tape to fall over the end of the threads, and into the pipe opening, this gets cut off, in the tightening process and enters the valve...On open faucets, it's not a problem, but in shower valves, it can get trapped.