On Tuesday, 20 March 2018 21:15:54 UTC, DerbyBorn wrote:
I really want to replace it all - one end compression is a bit crusty as
well. I don't want to leave a legacy of bodge! I want to cut a lenght out
and fit new valves with new pipe in between.

Are double check valves essential?

sorry, Jim won't let you.

Shower feeds don't usually have check valves. But there are showers that risk one feed coming back up the other. High flow / wide bore shower hose & head help a lot to avoid that.


NT