I have a Glow-Worm 30ci boiler which is leaking from the water flow sensor. The "O" rings need replacing. Can anyone tell me what size "O" rings are required
If you are able remove the o ring and take it to ur local plumber merchant who keeps a variety of sizes.
Make sure there is no water pressure behind the seal first.
keith brown, April 2009
Only go for the manufacturers genuine part - pattern ones are sure to leak eventually, if not straight away.
