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If you are installing this on 0.1 Bar then consider removing the non return valves when you fit it. On low pressures they have a tendency to stick and you may end up being called back due to no flow. If in doubt try blowing through the inlet elbow and you will soon see what I mean!
I have been considering this to increase the flow rate... are non return valves required on a tank fed hot & cold system... it can't back feed surely!?
I emailed bristan this very question & they recommended keeping them in etc as I was expecting!
I can't blow through th check valves relatively easily, but still a restriction no doubt