Connecting 22mm pipe to old stop cock

[AssetProduc...@aircominternational.com]

I need to replace a section of 3/4" copper pipe with 22mm. Can I
connect the new 22mm pipe to the old stopcock where the 3/4" pipe was
originally connected? Will a standard 22mm olive do the trick? I
assume I'll need to find a different nut from another 22mm fitting.

Thanks,
Dave.

[Allan Mac]

On 28 May, 09:18, AssetProductionSupp...@aircominternational.com
wrote:

HI,

you need a so called green olive. This is a special adapting olive to
get you from 3/4 fiting to 22mm pipe. Proper plumpers merchands are
your best bet, I doubt the large diy chains will know what you are
talking about.
Cheers

[Dave Plowman (News)]

In article
<3fa30467-450d-40af...@z7g2000vbh.googlegroups.com>,

You could retain a short part of the 3/4 pipe and use a convertor to 22 mm.

Or obtain a special olive for just this purpose. The first way might be
easier in practice, though.

--
*A plateau is a high form of flattery*

Dave Plowman da...@davenoise.co.uk London SW
To e-mail, change noise into sound.

[John Rumm]

The porky olive should do it, although I have successfully made joints
to old pipe using ordinary 22mm olives and tightening them more than usual.

--
Cheers,

John.

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[RobertL]

I've only encountered special olives to fit a modern 22mm fitting
onto an old 3/4" pipe. The OP wants to put a 22mm pipe into an old
(3/4") fitting.

I think he has to have a bit of 3/4" pipe in the old tap and then
convert to 22mm using modern 22mm fitting with a special olive.

Will a 22mm pipe actually fit into a 3/4" compression fitting?

Robert

[Dave Plowman (News)]

In article
<b8b1a710-ce98-4949...@r3g2000vbp.googlegroups.com>,

RobertL <rober...@yahoo.com> wrote:
> Will a 22mm pipe actually fit into a 3/4" compression fitting?

The OD is considerably less, so it will 'fit' in. The other way, no.

--
*A closed mouth gathers no feet.*

[Roger Mills]

In an earlier contribution to this discussion,

Dave Plowman (News) <da...@davenoise.co.uk> wrote:

> In article
> <b8b1a710-ce98-4949...@r3g2000vbp.googlegroups.com>,
> RobertL <rober...@yahoo.com> wrote:
>> Will a 22mm pipe actually fit into a 3/4" compression fitting?
>
> The OD is considerably less, so it will 'fit' in. The other way, no.

Err . . . 22mm pipe actually has a *larger* OD than 3/4" pipe - which is why
you need a 'fat' olive when using 3/4" pipe in a 22mm fitting.

22mm pipe (with a 22mm olive, of course) *might* go into a 3/4" fitting -
but it would be a tight fit. As others have suggested, a short length of
3/4" pipe may be needed, followed by a 22mm coupler with a fat olive on the
3/4" side. [Or you can get solder couplers which are 3/4" one end and 22mm
the other].
--
Cheers,
Roger
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