"Tim W" wrote in message
...
Tim W
wibbled on Friday 23 October 2009 15:28

Doctor Drivel
wibbled on Friday 23 October 2009 13:32


"A.Lee" wrote in message
...
Tim W wrote:
Might I get away with a 50mm jobbie, like:
http://www.screwfix.com/prods/42968/

Otherwise if I have to use a 110mm version, does it need to be
installed
above the flood level (so above the bog rim I suppose) or can it be
installed lower? The 50mm one above suggests 100mm above pipes and
below
flood level.

Bog goes in the side port and the sink goes into one of the small
side bosses.

OK - I got a Floplast 32/40/50 mm one. A highly scientific mouth suck
test
shows it seems to allow loads of air through and its operation is
silient (no farty noises) other than a hiss.

What adaptor did you use to plug the 50mm AAV into the 110mm downpipe?
I'm just doing a bathroom where it would be nice to have the AAV below
toilet pan level, rather than above it.

You cannot do that. It must be above the highest water level which is
usually the wash basin in the bathroom. In the case of a blockage,
water
must not touch the AAV. That is why Hep VO traps are a great get out of
jail product.

One of the AAVs (sure it was the Floplast but I can check) said that it
*could* be installed below the flood line.

Cheers

Tim


http://www.floplast.co.uk/uploads/So...20Brochure.pdf

Page 5 - "install [AV110] 200mm above highest joint"

Perhaps that is practically equivalent to "above the flood line".

Anyway, I'd install it above the bog's flood line (yuk if it leaked) but
perhaps I wouldn't worry so much about matching the flood line of any
secondary devices, eg basins - anyway, they'd probably just flood out the
bog rim of the main stack was blocked...

Not sure if that would apply to the smaller ones...

It must be above the basin. If the toilet is blocked at the tee into the
stack the basin water will touch the AAV. MUST be fitted ABOVE the basin.
You should have fitted a HepVo as advised by many here.