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Alterations to soil pipe?

I have an existing soil pipe in the the bathroom into which the toilet,bath and basin wastes are connected.
Question,can i terminate the soil pipe in the bathroom at say three feet and fit an air admittance valve
Mr Dodgon, September 2008
yes you can fit an AAV just keep it higher than the highest outlet(basin) and if boxing pipe in then build a full height duct and allow air in at top

steeveepee, November 2008