Plumbing – adapting from 5/8" to 15mm?

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April 13, 2004 at 8:50 am #5300

emigrant

I am close to the point where I use all the good advice from this site to plumb in the new sink & mixer tap, but find that the supply into, and

from, the stop-tap is old-fashioned imperial – seems to measure 5/8″.
Is the any other way of connecting this to new 15mm copper other than carefully filing down the oversize pipe? This is the only advice I have been able to get from “experts”, but

seems a bit ‘hairy’ – particularly when we are dealing with mains pressure?
Is it better to use pre-soldered fittings, or (and this is my inclination) are compression fittings better, because I can at least slather these with Boss-white!
One thought on cutting worktops – don’t throw away the old tops without using them for a bit of practice with circular and/or jigsaws. You cannot ruin something that you are going to

throw away!
April 15, 2004 at 12:22 am #5302

timfoley

This shouldn’t prove too much of a problem and the difference between imperial

to metric 15mm is minimal so the advice you received is correct.

What I would add is that after filing beyond the solder area of your existing mains pipe, use wire wool to ensure the surface is clean and apply self cleaning flux. You can use solder

ring or compression and personally I’d opt for solder ring.

Make sure no water is passing before you attempt to make the joint as this will make soldering much easier.
However, if you cannot fully shut off the mains it may be necessary to install an isolating valve as your first joint.

Good luck.
May 10, 2004 at 10:46 am #5348

emigrant

An update – I did get some 1/2″ to 15mm Yorkshire fittings from my local Plumb Centre, which

saved a bit of messing about, but where I was connecting isolators (compression) found that they were a perfect fit on the 1/2″ side – in fact the 15mm side needed a bit of a tweak

to get a tight joint!
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