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I presume there must have been an aav at my property originally. It has never been vented to air. Venting to air now would be unsightly and expensive. I do get the gurgling noises from the traps (particularly the shower and sink) on occaision. I can see why lack of an aav may cause...

Thanks for your quick reply, gas4you. Yes I think I will have to dismantle the box this weekend to check. I will let you know what I find (or don't find!) I don't know what a dirgo looks like, but I assume it would be obvious if it was there! I don't think I will be able to get the...

Hi We moved into our present house in 1989, when it was about 3 years old. The house has an internal soil stack, into which fed a loo and sink downstairs and a loo, sink and bath upstairs. The stack reached up to a few inches above sink level. About 10 years ago, we had the upstairs suite...