Sluggo
Member
I'm putting in a shower located on a slab. The slab was plumbed for this when the house was built, and I have a 12" X 18" hole in the slab which has a capped off ABS drain pipe to connect the P trap to (and a properly plumbed vent coming up through the slab right next to this drain pipe). My shower drain assembly is 2" PVC, so I will have to make a transition from PVC to ABS somewhere. Once the P trap is installed and the drain assembly is connected to it, I plan to fill the hole partially with sand to cover the drain pipe and most of the P trap, give the drain assembly a foam wrap, and pour 4-5 inches of concrete to bring the hole flush with the slab. For the PVC to ABS transition, is either if these options better: 1) install a PVC P trap and have the transition occur between the tail end of the PVC P trap and the existing ABS drain, or 2) install an ABS P trap and make the transition between the bottom of the PVC shower drain assembly and the front end of the ABS P trap?