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I ran all the pex and put valves on the end to test for leaks. I had no leaks, system worked as planned. Then the drop ear elbows came along with the brass nipples and 1/4 turn valves so I assembled everything and had nothing but leaks. Every brass fitting connection point leaked. I put Teflon tape on the threads and tightened them down. My concern is maybe I don't have the right thread match up. I have attached the plumbing vanity pdf which shows the drop hear, nipple, and valve I used. All leaked. Also I attached the plumbing pdf, which shows the shower valve and brass adapter I used, all leaked. Any help?