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Hi, thanks for you reply and apologies for the delay in responding but Covid finally caught up with me. Fighting fit now. I’ve contacted the customer to find out what’s happening here. I’ll investigate further and come back to you. In answer to your questions, yes it’s on the hot water side...

Hi all, I have a customer who has been suffering with airlocks on their gravity fed system for some time. Clearing the airlocks has been successful with the usual methods but they keep coming back. Would a Surrey flange help prevent the issue occurring? I suspect a Essex flange maybe better...