Air admittance valve for slow flushing toilet
Drainage and wastage systems and plumbing help, advice and answers

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Bill50
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Air admittance valve for slow flushing toilet

Post by Bill50 » Mon Nov 27, 2023 2:36 pm

When flushing the toilet it is slow to drain and air bubbles up through the shower drain. If I remove the air admittance valve all works correctly.
The current aav seems to be opening and closing but does not operate when fitted. I have tried a replacement aav and the fault remains, however the valve was bought online and the box was damaged. Is it likely that both aav’s are faulty?
Thanks in advance.

stoneyboy
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Re: Air admittance valve for slow flushing toilet

Post by stoneyboy » Tue Nov 28, 2023 10:12 pm

Hi bill50,
Presumably you do not plug the hole where the AAV is fitted for the second of your tests. I also assume you have an open stench pipe at the highest point of your soil system. Most likely that there is a defect in the falls on the main soil pipe or you have a partial blockage. The problem will be finding it.
Regards S

Bill50
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Posts: 4
Joined: Mon Nov 27, 2023 2:22 pm

Re: Air admittance valve for slow flushing toilet

Post by Bill50 » Wed Nov 29, 2023 10:42 am

Thanks very much for your response. I was thinking the same thing as the fault is intermittent and also Southern Water are regularly “fixing” drainage problems in the area.

stoneyboy
Project Manager
Project Manager
Posts: 6443
Joined: Wed Dec 10, 2008 6:44 pm

Re: Air admittance valve for slow flushing toilet

Post by stoneyboy » Thu Nov 30, 2023 9:53 pm

Hi bill50,
Unfortunately water boards generally seem to have a sticky plaster approach to problems, hope you get your sorted.
Regards S

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