Hi ...….I am replacing the ball valve in my expansion tank. The existing one is a part one , so I have purchased the same. Luckily I made some enquires before I fitted the new one and have been told I should be using a part two. The old valve was fitted round about 1975. Do I really have to use a part two, I have had no problem with the old one when it started leaking the water ran out of the overflow before it reached the inlet flow hole.
help please
mickcoulson
help please
mickcoulson