On 20/03/2018 17:51, DerbyBorn wrote:
In my loft I found a bit of a leak.

The hot and cold to the shower both have a in-line stop tap and then a non-
return valve / check valve. (30+ years old)

The stop tap is weeping a bit and other parts are a bit crusty - I think I
should make up a couple of new lengths with new valves (for what they cost)
and splice it into the existing pipework.

Any recommendations on what fittings are best for this job - bearing in
mind it is hidden away in the loft?

What size pipe? Metric or Imperial? What material - copper or stainless
steel?

Assuming it's copper pipe in metric sizes, use solder joints when
splicing new sections in. Once you have checked they don't leak, you can
forget about them.

When replacing the stop taps, use full bore lever-operated ball valves
instead of bib taps.

In a later post, you ask whether check valves are essential. Where does
the water come from for the shower - is it gravity flow from a header
tank for cold and a vented stored hot water system - or is it all at
mains pressure, with an unvented hot water system or combi boiler? You
only need double check valves if there's a danger that dirty water could
get sucked into the mains in the event of a mains failure.
--
Cheers,
Roger
____________
Please reply to Newsgroup. Whilst email address is valid, it is seldom
checked.