Yes, it's an air admitance valve (AAV). It allows back pressure in the
soil pipe to be released, and is an alternative to a vent to the
outside in some situations.
It's probably blocked. You can get a new one from any plumbers
merchants. About GBP15.
Why? They are absolutely fine if working properly. This one clearly
doesn't (it should not allow smell to come out) - it has a one-way membrane
in it which that only allow air in one direction (into the soli pipe, and
Why? The words 'if' and 'should' when it comes to whether I am going to
smell poo in my kitchen or not are my main reasons. I do appreciate that
there may be situations where this arrangement is the only choice but if
it was my install I would only have it as a last resort.
"JoeJoe" wrote in message
Couldn't agree more,the thought or arrangment of having a shit pipe in the
kitchen is not on.
On saying that I've just had one removed out of my kitchen even though it
was boxed in,if there is no other option which I find is hard to believe
then fine but if it can go outside then thats the place and only place it
On Thu, 4 Oct 2007 19:29:02 +0100, Andy Hall
Yes indeedy, I've got one on my one and only soil stack that was
originally boxed in in the bathatorium. Is this OK ?
It got truncated when the bathatorium was re-worked into a
showeratorium and is now terminated with a durgo valve under the
worktop next to the wash basin.
Occasional damp / foul smells permeate the showeratorium. Seemingly if
the door has been closed for a few hours. However I can not eliminate
the possibility that leaks from ultra crappy quailty chinese basin
waste remote controlled plug mechanism are not encouraging the crappy
quality cabinets (Apparently made of veneered weetabix) to rot away.
It's 38 years since the Niel Armstrong got out of his spaceship on the
moon, and we are living like this.
Maybe if you'd spent as much on the showeratorium as NASA spent on
Neil's spaceship, you'd have got something better than veneered weetabix.
Or maybe it just wouldn't have fitted because they'd confused inches and
I spent more than enough, the contractor didn't ask for more. Now I
simply want it to work. It looks like it's myself that will have to
make it work which is what makes it a uk.d-i-y issue.
Yebbut that would have been their problem.
As it stands (or falls !) I'm stuck with it :-((
And it is built of very ordinary components/materials. Which makes me
wonder do these valves fail a lot in such a condition that
they admit smells into the room ?
DG ( gOwain away if the smell doesn't)
This was the rules as given to me by a BCO. He seemed a reasonable chap
and not one to gold plate the regs. Apparently the most upstream
inspection chamber must be open vented via at least one soil stack . There
is no reason not to use AAVs on other soil stacks even ones that go to
to the same chamber.
He also said that the common practice of dropping grey water into a hopper
and then into a downpipe was also wrong. I pointed out that there must be
5 million houses in the UK that do that and asked when did this rule come
in. He said it was it was lack of enforcement at the time the rule was
there in the 1930s.
Both, but the level of compliance on the latter is very poor.
He also mentioned that the grey water wastes that discharge into a
gulley must go down through a gulley grid, and exit above the water
level in the gulley trap. There must be 10 million homes which breach that
Another BCO but who I think gold plates the rules said the
shower waste had to go direct to the soil stack - that's got to be over
I was under the impression that before a certain date, it was common
practice to combine surface and foul drains or was the point that they
should be separate above ground regardless of what happens below?
Several houses that I've lived in in the past had the exterior hopper
and downpipe arrangement but it always fed into a gulley.
I don't see the logic of that one. Pehaps that he thinks that
people piss in the shower but not in the bath.