Installed a 2.5g water heater expansion tank off of a existing 3/4 brass T on copper cold supply line on wall next to tank. Brass T does not point straight up but away from wall about 22 degrees. Used Teflon tape, 5-6 wraps everywhere on brass fittings, except at base of tank where manufacturer requires pipe dope also. Tank is vertical with threaded stub at bottom. (Sorry I can't do pix here). Tank is supported with metal strapping both horizontally and vertically.
From crooked T and cold line hanging on wall: small nipple, 90d elbow, small nipple, another second elbow pointing upward and tank.
Got a pinhole leak at bottom of first elbow. Each time I undo straps and retighten, this joint swings down due to the angle of the threads and the weight of the tank.That creates a space for water to invade, despite my tightening it.
I'm wondering if I should just get rid of this T, replace with a shark bite pointing outward, and repair using shark bites? Each redo requires a complete disassembly as parts can't be rotated due to the wall...and one threaded piece un- does the first elbow a bit.
Will the T plus 2 pipe dope that I smeared on the pinhole leak work to seal and harden? Not looking for new idea/ways to plumb. Already bought the shark bites but I'd prefer to get the brass fittings tight.
Is there a trick to get a threaded fitting to point in a certain direction when you are finished screwing?