Old 3/4'' 20mm copper.

[cdavie2002]

Is it ok to use a 22mm compression fitting on (20mm)/(3/4'') pipe to connect to modern everyday 22mm copper? It's holding this far, took a bit of torquing!

 

[lame plumber]

if you use a 3/4" olive

 

[Killy Bing]

*facepalm*

you need to use an imperial 3/4 olive......

tell us how long it holds for

 

[BN9Pete]

Is it ok to use a 22mm compression fitting on (20mm)/(3/4'') pipe to connect to modern everyday 22mm copper? It's holding this far, took a bit of torquing!

Its holding so far?
see what happens when you turn on the water:confused5:

 

[PlumbBobBob]

as said it really needs a 3/4 olive which are readily available

 

[snowhead]

Answer = NO

It took some "torquing" to squash the 22mm compresion ring so it just touches the 3/4" pipe, not enough to grip it.

She's gonna blow..

 

[cdavie2002]

Water has been on all day, dry so far....

Il get some 3/4 olives tomorrow, just incase.

 

[cdavie2002]

Stupid question....

If using a smaller olive in a 22mm compression fitting, do I just need to apply extra turns?

Thanks

 

[lame plumber]

I agree it is

 

[townfanjon]

Its holding so far?

Chuffin wouldnt if I had used one

 

[snowhead]

Stupid question....

If using a smaller olive in a 22mm compression fitting, do I just need to apply extra turns?

Thanks

No more than normal once the slack has been taken up in the fitting.

 

[tom609]

I wouldnt go to bed or go out without turning the water off or you might find a rather large puddle on the floor or maybe even the ceiling on the floor if the pipe is on the 1st floor

 

[lame plumber]

theres yellow flood warnings all over tonight and one red one in your house

 

[Best]

A 22mm olive can & will do the job on 3/4" pipe if it is fairly beefy type, like a brass conex olive. They are done that way by lots of people.
It will be more likely to angle on the pipe though & needs to be compressed carefully.
But why would you? Better using a proper 3/4" olive.

 

[kimbo]

I have just renewed some black pipe marked 3/4inch and a 3/4olive wouldnt go on it. I bought a 3/4inch to 20mm connector followed by a 20mm to 1/2inch stopcock.