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Thanks for help, Is this the replacement part you refer to? Just for a matter of interest as an engineer (cnc turned parts) what is inside this heat exchanger? The hole from which my leak (now a steady drip) is coming from, was obviously there for a reason, or was it just a standard part...

Please can anyone shed any light on a leak I have on my boiler, it is the large black 3 cylinder component at the left of the boiler, I have a dribble coming out of the top front hole, two questions:- what is it ? Why? It looks as if it has been leaking for ages, with the only noticeable...