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Un-vented Direct Hot Water Cylinder - part identification

Posted: Fri Jan 31, 2020 7:57 pm
by Dannyboy205
Hi,

I'm struggling to identify the part below, and its purpose. Is anyone able to shed some light on what it is?

Its in the air in cupboard next to the hot water cylinder. This system has leaked in my dads house, so I'm trying to find out a little more about it and its purpose.

Many thanks,