Hmmm, I've done it with problems, maybe you were lucky. I've used a JG
fitting on Hep pipe and it leaked, used a Hep fitting and all was
fine. The JG fitting was used on JG pipe and it worked, obviously the
JG\Hep combination at fault then!
22mm isn't neccesarily 22mm, there can be slight descrepancies in
tolerances between brands, and frequently are, just look at waste pipe
sizes between brands and SW\pushfit.
But that's a very different situation - it's intentional, because of the
different materials (pvc/abs for SW, pretty much anything for pushfit).
I've not found discrepancies, and one very good reason people like Hep
and JG avoid them is so that you can use standard 22mm copper pipe with
their fittings - after all, they are advertised as being compatible with
all standard copper sizes!
What problems did you encounter? What kind of leak was it?
Erm, a wet leak! Nothing major IIRC, although I was working 6" from a
1/4 turn valve so it never developed past that stage, I imagine it
could have though.
Although both makes do seal onto copper they don't seem to work with
each other, I think it may have more to do with the sealing mechanism
than pipe sizes. I never looked into it, I just remember to use the
same make together when needed.
In my experience both sorts of fittings work equally well on all sorts of
pipe. I can only think that the poster you had trouble with the JG
fittings must have not used them correctly.
JG fittings are definitely significantly harder to fully push home
relative to the push required to insert the pipe initially.
Hepworth fittings are generally stiffer but less of a two stage process.
Perhaps that was the reason for the trouble.
Ed Sirett - Property maintainer and registered gas fitter.
The FAQ for uk.diy is at www.diyfaq.org.uk
Maybe, never had a problem with JG fittings on JG pipe or Hep fittings
on Hep pipe so I wouldn't have thought so. I wonder if it has
something to do with the age of the Hep, did they change the size at
any point, I know they changed the style of fittings a couple of
I've had problems with a significant percentage of joints when using
speed-fit fittings with Hepworth pipe - I still have a hole in the garage
ceiling from just such a joint. I've never had any problem with all Hepworth
installations. I've also had no problem with the joints I repaired by simply
removing the speedfit fitting and putting in the Hepworth equivalent.
Providing you use the correct pipe insert for the pipe then the actual
fittings are all pretty much compatible. While the outside diameter of the
pipe is standardised, the internal diameters can be different. There is
some info regarding this issue in the Marely Equator design guide, available
,but its a 2.9Meg download for one page of info relating to this issue.
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