DerbyBorn Wrote in message:


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.

Mains - and mains feom Combi. I suppose syphoning could remotely be
possible if shower head was left in bath tub water.

Copper pipe - 30 years old so should by 15mm. Not keen on solder in loft.



Why do you need stop taps at all? Are you likely to shut off the
shower feed for hours/days?

In a hotel obviously you don't want to shut off all the water but
in a domestic situation it's not much of a hardship to just turn
off the incoming mains for an hour or two.

Tim
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