non return valve is definately the way forward as you never want any unwelcome visitors.
also have to consider the type of shower tray your getting as to thew feasability of plumbing it in. Ideally you would go for a low profile
40mm tray which would look great but you may need one with legs to accommodate the plumbing beneath it.
Well thanks for sharing.
Use a HepVo - minimal height and no return or 'visitors'.
stink.
I've narrowed it down to the shower trap, which appears to be the source of the smell & has been found empty on occassion. Doesn't appear to be leaking anywhere, so I assumed it was being sucked dry by some kind of siponing.
The waste feeds into a soil pipe and there is an air admittance valve on that - which I've changed - but not solved the problem.
Do you reckon one of these HepVo's might sort it? Not come across them before.
IME it'll take far more back-pressure than a wet trap - even a deep one - correctly intalled. There are some figures somewhere but I can't remember where I saw them.
Aha! The current trap is V shallow. When you say back presure.....?
Well, filling a v. deep U-trap (new one, before fitting!) - the adjustable sort - and blowing back through it sprayed water everywhere (in the garden, fortunately. I can exceed the top limit of a peak volume meter and was a bit over-enthusiastic with the trap). With the HepVo I couldn't blow back at all. Yes, there might be an issue with something in the sleeve preventing a perfect seal, but this could happen with any sort of vent and with a trap a thread or a couple of longish hairs will slowly drain the water out.
Hepworth's site is a nightmare to navigate, as most searches yield loads of pics. and logos, but if you go to
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