Do I need a P Trap for new shower waste?

[Bosh787]

Hi,

First time doing a bathroom remodel - took out bath to replace with shower but the bath waste is too high and I want to do a wetroom style.

I have 7cm of aggregate / screed over the top of the ply sub-floor so my plan is to lay the new shower waste pipe into a channel cut through that and use a Wirquinn Extra Flat shower waste which is only 4cm together with a strap boss onto the waste stack so I can get get the slope.

The Wirquinn waste has anti-ordour mechanism built into it so does this mean I don't need / should not install a P trap on this new waste line?

Many thanks,
B

 

[Ben-gee]

I presume it is a waterless trap, with a collapsing bag non- return valve.
No you don’t need a p-trap as well.