Compression fit joints

[Dave12345]

Whats the best jointing compound to use on compression fit's.
Is liquid PTFE as good as any or is one that dose not fully cure a safer option.

Dave

 

[ArtfulBodger]

You shouldn't have to use anything. The olive makes the seal when it compresses, however, don't tighten the joint too much or you'll just flatten it.

 

[Dave12345]

I was always lead to belive it was good practise to prevent weeping around the olive.

Dave

 

[BAD_BOB]

Olives make you cry? Not very keen on them myself either

 

[oilman]

It's onions that make you cry. Wouldn't recommend any jointing compound for onions, just cook them. They're all right afterwards.

 

[Malc]

Wouldn't boss green/white be the best option. That would fill any small gaps but still allow the olive to compress as it would just squeeze it out the way. Anything solid like ptfe tape would make a gap and it's the olive that should be compressing.

 

[JPC]

as mentioned should not need any, however just a small amount of jet blue helps (plumb centres own i believe)

 

[ChrisR]

In an ideal world you wouldn't need anything. But if the pipe had an old olive you removed, the capnut didn't come with the fitting, you can't get the recommended amount of turn on the nut before things get difficult (even if you DO know what the book says), or the whole fitting quality is poor, then some sort of compound makes a sucessful joint more likely.

Liquid PTFE's don't set hard (that I've seen) whereas oil based things like Boss White do eventually. PTFE tape on the olive seems to work - it squashes to nothing. Jet Blue seems to be better than many goo's.

 

[Dave12345]

Thanks I'll get some Jet Blue.