Bath: 75mm trap or 50mm Anti-syphon trap?

[jamie345]

Hi there

Looking for advice from you hardened pros...

Have bath, feeding into soil stack, via 3.1m of 40mm pipe with two 90 swept bend. (The run was going to be only 1m until I decided to flip the bath round for a better view!)

Currently fitting the bath, I could fit the bath 600mm high (rim to floorboards) so I can fit a 75mm trap beneath (not keen to cut the floorboards) OR I could fit the bath lower with one of those 50mm anti-syphon traps...

Any advice as to the best course of action??

cheers

 

[Mike Jackson]

Use an 1 1/2" HepVo valve with a knuckle adaptor. This will also act as an AAV and help prevent syphoning of other traps.

 

[jamie345]

Use an 1 1/2" HepVo valve with a knuckle adaptor. This will also act as an AAV and help prevent syphoning of other traps.

Thanks for reply Mike. Since posting I've managed to find a different route. Now I've got 2.7m run with 2 swept bends - which I guess is equivalent to just over the 3m mark.

Are the HepVo valves vulnerable to getting bunged up with hair etc ....

 

[Ermintrude]

I hate fanny traps. Hep ones. Fill with slime and stop working after a while. Fit a tee and bring a seperate Aav and use a low profile trap. Aav needs to be at spill over level or do it really old school, fit a tee close as u can to trap run 1 1/4 back to stack as high as u can below rim of bath at back and fit it into boss at same height on stack.

 

[AWheating]

fit a 75mm trap.