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Honeywell BS864-2 22mm possible to replace head without draining?

Welcome to the forum. Although you can post in any forum, the USA forum is here in case of local regs or laws

N

NIgel Hawcroft

I may have a faulty motorised valve head on a Honeywell BS864-2 22mm is it possible just to replace the head or must it be the whole fitment? Do you need to drain the tank to fit a new head on the valve?
Thanks
 

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