I'm installing a new shower valve for a new bathroom in our house. I've plumbed everything in, and I can't get rid of a tiny leak on the bottom of the shower valve. Since it's just a shower, I plugged the threaded tub filler connection with the supplied brass plug. No matter what I do, I end up with a leak of about 1 drop per 2 hours. I've got a pipe wrench on this sucker and have tried 3 wraps / 6 wraps / 8 wraps of teflon tape, but it leaks every time. Is there some trick i don't know about? My other threaded connections are leak-free.