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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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