AL_n wrote:
The header tank atop my immersion heater has a brass float-operated
valve. It started leaking last year, allowing water to leak out of
the overflow pipe. I took the valve apart and found that the seal is
formed by a small rubber disc, about 8mm diameter. It had become a
bit worn on the side that mates with the moving piston. So I simply
reversed the rubber disc so that the nice, flat pristine side was on
the side that touched the moving piston. All was well, or so I
thought.... Now it is leaking again!


Should I now replace the whole valve, or can a new rubber disc be
obtained from somewhere?

These brass valves have been around since time immemorial, and they
aren't exactly cheap. Is there anything available nowadays that is
cheaper and more reliable? Can anyone provide a link to a valve you
can recommend?

TIA...

Al

Any plumbers merchants will supply you you with the correct sized ball valve
washer and cone (change both) - or you could even try your a decent, local
builders merchant.

Cash