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Well it was only a few spits of water coming out as it deflated, and it didn't carry on coming out if I held the valve down, but yeah, I cant see how it could have got on the air side of the EXV if the diaphragm was ok. Thanks for your help everyone, new expansion vessel on order.

I have a baxi duo-tec that's been installed for about 2 years, since coming back on this season, the system has been losing pressure at a dramatic rate, requiring topping up daily to start with, now twice a day. I've spent a day checking the system for leaks as best I can, didn't find...