Alde air bleed extension fitting

[Brian123]

hi all

I have a small leak from the joint between the end of the alde extension tube and the alde bleed valve (see pictures).
I have removed the leaking valve and brought a new one....here's my question.......should i use any type of sealant or PTFE tape between the new valve and the old extension tube?

 

[Landy Andy]

Is there a rubber or fibre washer inside the threaded hole?

If yes, nothing is required, in not then I would use PTFE tape, or a sealer on the threads before inserting.

 

[MisterB]

Is there a rubber or fibre washer inside the threaded hole?

If yes, nothing is required, in not then I would use PTFE tape, or a sealer on the threads before inserting.

And remember to put the PTFE tape (if required) on the correct way. ..!

 

[Brian123]

Is there a rubber or fibre washer inside the threaded hole?

If yes, nothing is required, in not then I would use PTFE tape, or a sealer on the threads before inserting.

Hi LA thanks, no washer supplied just thread on threads

 

[Landy Andy]

Hi LA thanks, no washer supplied just thread on threads

If relying on the threads I would use PTFE tape, or some sealant, but PTFE is cheap and easy.

If when you dry assemble it and the insert bottoms out, and it has a flat base, you could try and find a rubber washer, or fibre washer, but you need both parts that contact each other to be flat so the washer doesn’t distort, or become cut.

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[Brian123]

thanks for your comments and answers

I just had a call with a technical guy at Alde, he said no PTFE, no washer just use Loctite 577 thread sealer and not to overtighten the valve

 

[stevewagner]

I would use LSX plumbers sealant. It is made for that sort of job and is excellent.

 

[KNWH]

As a general point, PTFE is most effective when used on a tapered thread, i.e. the male threaded part is slightly conical so it jams in the female thread before it ‘bottoms out’
Parallel threads normally use a sealing washer