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| grafty99 Member Since: 15 Aug 2012 Location: North Devon Posts: 4784   
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Normal compression fittings do work with plastic as well as copper. Usually you have a little stainless insert in the plastic pipe to stop it crushing too much
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15th Jul 2020 11:40pm |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 3997 
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Thanks Grafty. So it might be possible to re-seal it with a fresh copper olive and some PTFE tape then.
On a side note, I hate that they have used plastic to the rads. Looks rubbish and is all bendy 2007 110 TDCi Station Wagon XS |
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15th Jul 2020 11:44pm |
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| Co1 Member Since: 19 Aug 2018 Location: North Yorkshire Posts: 3618 
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You might struggle to get a good seal again. There is likely some “spare” pipe in the wall. Pull it though an extra inch, remove the insert and cut it back past the previous compression marks and go again with a fresh olive. Don’t forget the put the insert in first though.
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16th Jul 2020 6:10am |
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| Chugga90 Member Since: 07 Sep 2014 Location: Bucks Posts: 195 |
Might just want nipping up a touch?
Could just be that simple. Or they could have missed the insert out of the pipe? Usually poly pipe gives no trouble at compression fitting joints. |
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16th Jul 2020 6:57am |
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| andydef90 Member Since: 09 Feb 2015 Location: yorkshire Posts: 617 
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as above if not grafty is spot on ptfe and a olive
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16th Jul 2020 6:59am |
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| Bluest Member Since: 23 Apr 2016 Location: Lancashire Posts: 3997
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It may be self inflicted. I’ve been placing the floor so the pipes have probably been pulled around a bit. 2007 110 TDCi Station Wagon XS |
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16th Jul 2020 9:27am |
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831 
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I know several years ago when we had had the bathroom altered the plumber used copper to plastic compression fittings that failed after a couple of days, this was on the hot water side ,luckily the floor tiles hadn't arrived so the bath side hadn't been fitted and the leak was noticed. The plastic pipe was removed and copper installed. I didn't look into it further into the cause but I would suggest it it is down to the different expansion rates of the different pipes.
The plastic pipe will have a brass insert to prevent the pipe wall collapsing when the fitting is tightened and the olive bites into the pipe. Don't make old people mad. We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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16th Jul 2020 10:23am |
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| bear100 Member Since: 22 Mar 2010 Location: South Wales Posts: 1874  
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Bluest, try tightening the nut first quite tight, if it still weeps drop the pressure and use a couple of wraps of PTFE not to many, and retry.
If this fails a new insert and olive. More than likely there will be a bit of play in the pipe to cut back just after the olive if not just tap the radiator over slightly. Give me a shout if you need too 2016 Range Rover Autobiography 4.4 TDV8
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16th Jul 2020 11:15am |
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