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I can see that the replacement AAV is identical to the faulty one. There is a larger 1 1/2 inch o ring seal already up to the shoulder as you say. The o ring seal I refer to is a mere 3/4 inch in diameter and will not fit on the AAV even if you stretch it as far as possible? As previously...

New to the forum and would appreciate some advice. I may be going mad but where should the o ring seal for the automatic air vent be fitted. My AAV is leaking so I purchased Baxi part no 248043, the AAV, and also the associated o ring seal which is Baxi part no. 248044. I can clearly see...