On Fri, 21 Nov 2008 09:40:35 +0000, Rod
wrote:

robgraham wrote:
On 21 Nov, 09:12, robgraham wrote:
On 20 Nov, 21:15, Rod wrote:



Stephen wrote:
Hello,
What is the best type of trap for a bath? I'm sure that I've read here
before that bottle traps are not recommended because they can clog
with hair etc. but the alternative seems to be a shallow bath trap
with 20mm seal and I thought these could be emptied easily by syphonic
effects. Is it best to have a large P-trap with access hole for
cleaning?
Is the idea of the shallow trap that it will fit between the bath and
floorboards? In my bathroom someone has cut a hole in the floorboards
to fit a larger trap. Is this a problem? Do fire regs. mean that all
floor should be boarded? If so, I've got a gap in the airing cupboard
floor too.
Why is the seal height of a trap always given in millimetres: why
don't they just say standard or shallow? Is the number of millimetres
that critical?
Thanks,
Stephen.
Just to make sure you do know the alternatives, there is also HepVO.
Which I fitted to our bath. Fastest emptying bath I have ever had!
--
Rod
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Although common it frequently goes undiagnosed.
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Thanks for that lead on the HepvO products - I ought to fit an air
admittance valve to our bath trap but one of these looks a better
option.

Literature is available on this webpage (pdf file)

http://www.hepworthplumbing.co.uk/He...e%20valves.pdf

Rob

A thought came to me after writing the above, and I apologise for the
slight hi-jacking of the thread. The 'suck-out' that is occurring in
our bath trap is due to the washing machine being on the same branch -
the problem being I suspect is that the vent pipe is downstream (old
cottage and the vent is a branch off the gutter downpipe) and hence
the washing machine outlet is effectively sucking air in through the
bath outlet.

If I fit a HepvO valve to the bath, the w/machine is going to struggle
to vent - correct ?

Rob

Should be no problem. The HepVO provides virtually no resistance to
inflowing air.

Could you also use a HepVO on the w/m connection? (Assuming it is
physically possible, that is perfectly acceptable.) So far we have three
(two basins and the bath).

We had a HepvO valve on a sink but we got regular bad smells and
replaced it with a conventional trap.

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