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THANKS ALL FOR COMMENTS!!! About 2m on a down slope under the ground floor of my house (solum area). I do not mean to come across as bolshy at all here - I am looking for advice - but I do know they have different purposes and that a Durgo is an air admittance valve, although I thought...

Check this out: Bold lines are 110 mm soil & vent, narrower are 32/40mm drains/vents. The previous install routed the 32mm to a tile vent as you describe, I was going to put a durgo in as shown in red (above highest flood level in system)and take away the 32mm branch vent, leaving the...

Hmmm yeah was just reading the "document H" and I suppose the installation could be classed as a branch ventilation pipe - although the high point of the vent does not tie into an existing stack it just goes up through the roof space. Thanks for reply has made me think again before ripping this out!

I am refitting my bathroom and found an unusual setup when I pulled out the old toilet and floor. The toilet waste was not routed "out the wall" so to speak but instead it came out a 90º pan connector and then a 87.5º bend under the floor - then there was a boss coming off the pipe under the...