40mm Waste NRV??


Postby chris_on_tour2002 » Fri Sep 26, 2008 8:58 pm

Hi

Does anybody know where I can get an NRV for 40mm waste pipe? And will they work on air pressure alone?

My shower waste tees into the waste pipe for my bath, so when I empty the bath the rush of air blows the water out of the shower trap.

I've tried all the local merchants to no avail. Many seem to think that they don't exist but I can't believe that. They all stock 32mm but not 40mm. I could reduce the pipe and use a 32mm but I have a low profile tray and want the larger bore for decent drainage flow.

Thanks!
chris_on_tour2002
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