Metric to Imperial compression joint

  • Thread starter Thread starter easyt
  • Start date Start date
Status
Not open for further replies.
E

easyt

My house was built in 1964 and I assume all piping was then imperial. As part of the work I am undertaking I am replacing the WC. The existing water supply comes through the wall from the bathroom from a a Tee compression which is fairly tight to the bathroom wall. As the pipe was never protected from the effects of cement and the layout of the pipe will be different on the new toilet cistern I intended to extract this pipe (after undoing the 45 year old compression nut 😱) and fit a new pipe into the existing fitting.

1. Will a metric 15mm go into the old half inch compression??

If not I will simply cut the half inch pipe in toilet and come off with 15mm. (If the old pipe hasn't failed due to cement corrosion in the last 45yr it will probably carry on).

2. If I decide on this option will the old half inch go into a modern 15mm compression??

I have come across the situation before but can't remember the answer. (Memory just aint what it was 🙁
 
Last edited by a moderator:
Metric will go into 1/2" compressin easily. 1/2" will go into 15mm (may need a bit of persuasion with a mallet). Make sure you clean any paint off first!

The old pipe will only suffer with the cement if the area is regularly damp.

Old tee should open up OK but grip the tee body as well as the nut to avoid damaging the surrounding pipework.
 
Last edited:
So the old 1/2 inch is larger outside diameter than the 15mm. I am surprised. I expected that the old 1/2 inch with the thickness of copper pipe would be less than 15mm. I suppose that the pipe wall must be thicker than I had appreciated. Thanks for the info.

Easy T
 
I used to file it to fit , but nowdays you might as well use a plastic push fit on it & yes they do go straight on as ive just used one last week
 
At that age you may be dealing with an old drift coupling.If so u would need to drift out your new copper to make it fit the existing fitting and re-use the cone sealing it with a jointing compound,
 
Status
Not open for further replies.

Featured Content

Back
Top