dripping valve next to hot water tank

dripping valve next to hot water tank

dripping valve next to hot water tank

I had my boiler repaired by British Gas yesterday but what I assume to be a relief valve at the top of the vertical pipe alongside the tank is weeping.

Can anyone confirm what this fitting it and how to sort it? I have reduced the boiler output temperature to 60 degrees and that seems to have reduced it.

by Davidt50

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