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Thanks, I will contact McAlpine and see what they say.

Thaks for the replies, The only thing conneted to the stack is the toilet, bath and sink and. This AVV worked all through the heat of last summer so don't think it's excessive heat in the loft causing an issue.

Hi, I have an AAV fitted to the soil stack that terminates in my loft. It's a McAlpine VP50P and I've noticed that there is condensation dripping from it. This is the second one I've had in just over 2 years as had the same issue with the other one. When I remove the top the sealing ring that...