Push fit for 3/4in pipe

[zinnia48]

I have an old bungalow, which has some old 3/4in pipe in places for the hot water feed, i am having to do some remedial work in the bathroom and it would be so handy if thee was a 3/4in to 22mm push fit connector, does one exist?. Otherwise will using a standard 22m push fit leak. Having done a test on an old piece of pipe it seems to lock ok into the fitting. But will it work under pressure?, I have a combi boiler by the way so the pressure is higher than tank fed hot water. at the moment have to make a 3/4 to 22 connection using 22mm straight couplings and a 3/4in olive , which i find tricky to seal. Any solutions to my ramblings?

 

[Blasphemous]

Yeah they exist. You'll probably get one down at your local B&Q.

 

[arfurrrr]

i`m sure hepworth hep20 have just brought out imp to met push fit fittings

 

[Softus]

I have an old bungalow, which has some old 3/4in pipe in places for the hot water feed, i am having to do some remedial work in the bathroom and it would be so handy if thee was a 3/4in to 22mm push fit connector, does one exist?

I've never seen or heard of one.

Otherwise will using a standard 22m push fit leak?

Like a sieve with a hole in it.

Having done a test on an old piece of pipe it seems to lock ok into the fitting. But will it work under pressure?

No - the 'O' ring won't seal, and grab ring probably won't grab enough.

at the moment have to make a 3/4 to 22 connection using 22mm straight couplings and a 3/4in olive , which i find tricky to seal.

You must be doing something wrong - I use these all the time without any problems. Try tightening up the fitting dry, just enough to crimp the 3/4" olive onto the pipe, then undo the capnut and wrap 4-5 turns of PTFE tape around the part of the olive that meets the cone of the fitting (NOT on the capnut side, NOR on any threads), then do the fitting up again.

 

[zinnia48]

thx for the reply's, in your reply softus on sealing connection, if i read u correctly u put the ptfe tape around the olive on the piece of pipe that fits into te connector, not on the side when the cap lock screws up?, have i got that corrctly , so that when u push the pipe back into the coonector prior to tightening the ptfe tape would be hidden

 

[Softus]

in your reply softus on sealing connection, if i read u correctly u put the ptfe tape around the olive on the piece of pipe that fits into te connector

Correct.

...not on the side when the cap lock screws up?

Correct.

have i got that corrctly

Yes.

...so that when u push the pipe back into the coonector prior to tightening the ptfe tape would be hidden

Yes - when correctly applied, there is no PTFE visible after doing up the capnut. It forms a soft seal between the olive and the fitting cone, making up for any tiny imperfections on the surface on either of them.

Some people hate PTFE, and prefer to smear mucky jointing compound instead - the stuff that can harden, shrink, crack, get washed away, and generally fail if you leave it for long enough.

The choice is yours...