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Posted: **May 1st, 2020, 2:03 pm**

is this connected to an unvented system?
#2 is a check valve

Posted: **May 2nd, 2020, 2:16 am**

Just to check, -
Does this top up and maintain the pressure on a heating system, - or is it for an unvented hot water cylinder?

Pressure Reducing Valve Has Two Controls ?