Ariston SX 20 MFFICE Pressure Valve Attachment

[adshiel]

I recently replaced the pressure relief valve on the above boiler which has worked wonders for my boiler (no draining and hence heating stays on.)

However I have noticed that there is an attachment that looks like a drain plug. I reattached the original to the safety relief valve but have since noticed it too is leaking (only when system gets cold.) Problem is I don't exactly know what this is and so don't know what to shop for.

Anyone got any helpful hints?

 

[ChrisR]

I I reattached the original to the safety relief valve but have since noticed it too is leaking (only when system gets cold.)

the original what?
what is "it too"?
What do you mean by a "drain plug"?
Sorry!

 

[adshiel]

sorry it was late last night and I'd been fitting out my electrics all day.

I believe the item I am looking for is a Vent Valve, but finding one is proving a challenge.