Durgo

[ShaunCorbs]

Mmmm... But how do you know if houses have them if they're internal?

My mum ex council house, 60's build. Soil stack goes in house & into ground. Never seen an aav/Durgo there. It's a terraced house so they're all the same.

you should either see one in every six with a vent or all vent as its 60s will be vented prob cast as well

 

[rocketmanbkk]

Yes, it's cast, maybe it's in the loft, I'll look Sunday.

Going to bottom this out this week so it sinks in, now a bit confusing!

Maybe once again I'm over thinking it

 

[plumben]

As said 1 in every 6 houses on the line or the last house on the line must have open vent
And aav or durgo is so save the need to extend a vent up through the house say if you add an additional bathroom or en suite to an existing house,

And yes they will help if a sink is getting air locks although usually its because of a blockage