Linked Questions

12 votes
12 answers

What goes on threads first: tape or dope?

Should the dope be applied directly to the male threads or should the tape go on first?
Matthew's user avatar
  • 9,867
9 votes
6 answers

Prevent air leaking from couplings on an air compressor hose

I recently purchased an air compressor. When I turn it on without a hose attached, it seems to work fine. It gets up to 140 PSI and shuts off the motor. As soon as I attach the hose, I can't get ...
Stephen Ostermiller's user avatar
19 votes
2 answers

When is pipe dope/tape needed?

When is it appropriate to use tape, dope, or nothing at all when connecting pipe fittings? Several advised not to use any product when I posed this question. What is the purpose of each product, and ...
glenviewjeff's user avatar
  • 1,450
8 votes
2 answers

Can you disconnect and reconnect a gas flex pipe?

I installed a new dryer last week and, in doing so, purchases a new flex pipe as they say you should never re-use the old one. I now need to make some adjustments to the flooring so need to pull the ...
DA01's user avatar
  • 24.3k
3 votes
2 answers

Should I use Teflon tape or pipe dope when connecting PVC to metal?

I am in the process of repairing PVC pipe, which was broken due to freezing. I'll be connecting the PVC pipe to a metal check valve. Should I use Teflon tape or pipe dope when connecting PVC to metal?...
Chad's user avatar
  • 31
1 vote
3 answers

PVC to metal joint leaking

Some days ago I assembled the following joint using pipe dope (it is solvent based that semi hardens to a rubber like stuff). I waited 2 days to pressurise the system and after a few days it started ...
Luiz Borges's user avatar
  • 2,325
2 votes
2 answers

How should I connect nipples to a hot water heater?

I recently installed my new hot water heater. I know nothing about plumbing and my installation procedure was informed only by sketchy home depot employees and youtube. One of the issues I'm having ...
chad's user avatar
  • 235
1 vote
3 answers

Does thread compound (dope) over tape prevent this kind of leak?

When applying pipe joint compound, a.k.a dope, does the application of tape (Teflon tape etc...) not hinder a chemical bond between the compound and the threads, or is does the compound merely serve ...
P2000's user avatar
  • 16k
1 vote
1 answer

Can pipe dope be used on water lines in a vanity

Does it hurt if I use pipe dope on water lines connecting a faucet in a vanity?
Joe P.'s user avatar
  • 11
1 vote
3 answers

Leakage in my pipes, how to densify/seal?

I've never built with pipes before so maybe I'd need some general advice regarding leakage. On a specific note, I've built a system (see picture) where it leaks practically everywhere. I've sealed it ...
Lennart's user avatar
  • 137