"OldScrawn" wrote in message
...
Over the weekend I've had my shower header tank run dry a couple of times.
Mains pressure seems a bit low this weekend, but the ball valve is looking
tired and is an easy thing to change before I look further afield. Does
anyone
know which type might give better flow, metal or plastic? I suppose I
could go
up to a 3/4 inch.

Brass valves tend to be more reliable. 3/4" ones are cheap enough and fill
up fast.