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yes it has a mushroom type cap with holes round it. A photo of it is in my album named heating system, and yes the system is pretty old. No I'm not offended by folks comments at all, just pleased for any help.

Hello, Thanks for that suggestion, but I did find a merchant who can supply one, but they needed to know what pressure to set it to, and that is something I just don't know. cheers

Thanks for your response. The album heating has pictures of cylinder, valve and boiler plate (possibly too small to read). The boiler is a BAXI W M 531.R.S G.C number 41-077-01 CAT 2TN. There is no expansion tank in the system, and I have not met a system like it before! The...

Pictures of leaking valve and cylinder plus boiler name/make plate

I have a 20 year old system in a 3 bed-roomed semi. There is no expansion tank and the boiler is a Baxi WM 531 RS, working perfectly. There is a pressure release valve (1" BSP fitting I think) and it has started leaking. It is fitted on a tee at the return side from the hot water cylinder's...