Schluter® KERDI-DRAIN FLANGE KIT 3" STN STEELThe 3" stainless steel KERDI DRAIN bonding flange for installations requiring a larger drain connection and the flexibility of a no hub mechanical coupling. This is the commercial grade, renovation friendly option: no solvent cement, connects to either PVC or ABS pipe, and stainless steel construction that won't corrode in a wet assembly. Where the 2" drain handles typical residential bathroom flow, the 3" outlet moves more water faster relevant in