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Post by DIYDafty on Sept 23, 2020 23:00:13 GMT
Hello All
I've mentioned a couple of times the Fawlty Towers disaster that was me yanking off the stop tap some years ago. Anyway, I'm now redoing the kitchen but of course that incoming pipe stays. I'm not 100% sure it is alkathene but I think it is? For various reasons I'm still a bit nervous about that stoptap which has led me on to asking the question:
What is the correct way to join copper pipe on to a 1970s alkathene plastic pipe ?
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Post by tomplum on Sept 24, 2020 14:49:07 GMT
yes Dafty that is black alkathine, its called 1/2 inch because the bore is 1/2 inch the outside is 3/4 inch, So a 3/4 imperial compression with fit it or a
black alk to 15mm stoptap, if you can get one, another tip is use 15mm copper for an insert,
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Post by DIYDafty on Sept 24, 2020 15:09:34 GMT
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Post by tomplum on Sept 24, 2020 16:27:28 GMT
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Post by DIYDafty on Sept 24, 2020 20:40:56 GMT
RIght thats brilliant thanks Tom. So any 22mm compression fitting but using maybe an inch of 15mm pipe as an insert should work?
Steps:
1/ Remove existing tap from alkathene pipe leaving nut and olive on pipe
2/ check end of alkathene pipe and if no insert then push an inch of 15mm
3/ clean up and then wrap 2 or 3 turns of ptfe. maybe add some lsx for good measure
4/ Push on new valve or coupler and tIghten up as normal
Maybe though the old olive can be removed in the same way as from copper pipe so then can use a new olive?
I'm going to be updating my kitchen thread soon and you'll see why I'm worried about this fitting.....
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Post by tomplum on Sept 24, 2020 20:53:19 GMT
no, the old fitting and the new fitting will have a different thread, you will have to cut the alkathen , put the new fitting cone and tighten it up good, then undo it and check the olive is stuck on the pipe, then wrap a couple of loops of ptfe, and retighten, then work up from there, a small bitt of 15mm then a new stoptap and ready for test,
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Post by DIYDafty on Sept 24, 2020 21:09:08 GMT
Right thats perfect I've fully got it now. THanks again.
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Post by crowsfoot on Sept 25, 2020 6:54:59 GMT
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Post by tomplum on Sept 25, 2020 8:52:51 GMT
AH, well spotted Tappy, I did't notice that till I enlarged the picture, yes that would work and you are not cutting the alkathene,  |
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Post by DIYDafty on Sept 25, 2020 12:21:27 GMT
Thanks tappy. If the stoptap had seized that might be ideal but what I'm worried about is the previous leak right at the bottom where the pipe meets the old style nut. So if that gives me anymore trouble (or I drop another huge ceramic sink on it as I nearly did last week details to follow....) I'll go with Toms method. Shame there is no way to do it without cutting the pipe. |
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Post by crowsfoot on Sept 25, 2020 17:53:24 GMT
No prob's dd, it just seemed to me to be the best/easiest way to convert it.
Give that job to ten different plumbers and they'd more than likely all do it ten different ways.
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Post by tomplum on Sept 25, 2020 19:29:26 GMT
give that job to 10 different lady plumbers and there would be 1000 ways to do it,  |
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