Air admittance valve

8 Nov 2009
Reaction score
United Kingdom
I have a customer with an internal toilet fitted to a 1.5m SVP with an air admittance valve on top ,the push on type with a rubber boot and not solvent welded.
The trouble is the pan keeps backing up but when i remove the rubber boot or the valve the pan clears .
Is there anything on the market that would solve this problem.

Drainage firms have been but failed. and i have tried 2 types of air admittance valves.

Thanks for any replies
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an open vent will solve it ;) the local water co . clear drains now -they have adopted a lot more of the runs :idea: there is probably a blockage further down - it`s a common problem on the forum -

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