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Pipe Joint Compound vs. Teflon Tape: Which is Best for Sealing Pipe Threads?
Last Updated: 05/17/2018
I tried Teflon tape in my early years..
It never worked well on new metal fittings or fittings over 1/2" thread of any type material ( metal or PVC ).
Teflon tape does work well for small plastic fittings that are 1/4" and 3/8" ,
as commonly found under a sink or Reverse Osmosis drinking water system.

If you Tried Teflon Tape and you have a leak:
You need to be sure you have REMOVED 100% of any tape you used.
Then apply a thin even layer of Teflon Pipe threading compound.
And lastly, when screwing metal into metal, you must make the connection as tight as possible.
This usually requires two large wrenches.
A large Pipe Wrench to Hold the By Pass or metal Yoke, and a slightly smaller wrench to screw in the fittings,
using the first wrench to give you maximum leverage.
Since they are metal ( the fitting and the by pass ) you really can't Break Them or Over tighten.

This Video might help,



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