Schluter® KERDI-DRAIN FLANGE KIT 2" STN STEELThe 2" stainless steel bonding flange for KERDI DRAIN built for installations where you need a no hub mechanical coupling connection instead of solvent cement. Unlike ABS or PVC flanges that glue on, the stainless steel version uses a mechanical no hub coupling to connect to your drain line. The bonding flange itself still features the fleece surface for KERDI membrane integration the difference is in how it connects to the plumbing below. 2"