If you are referring to very thin teflon tape (which has no adhesive), then it's for
sealing threaded joints.
Unscrew, apply to the thread then screw up the connection. In the old days, plumbers
used sisal for the same
It is black, slightly adhesive, tape called SealWrap Repair tape. It feels
similar to electrical tape, except that you stretch it out as you apply it.
I have had it sitting in my basement for 2 years without using it, so
yesterday I decided to see what it would do. I taped up a 1.5" PVC pipe
joint. After 15 minutes, with one end clamped in a vice, it was very
difficult to pull apart. Not as strong as gluing it, but it would certainly
hold a drain together.
I don't know what it would do on a supply line leak. Maybe I will try that
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