Schluter® KERDI-DRAIN FLANGE KIT 2" ABSReplacement bonding flange for KERDI DRAIN the part that makes the waterproof connection between your drain body and the KERDI membrane. If you're replacing a worn flange or building a new shower with an existing ABS drain body, this is what you need. The fleece covered ABS flange bonds into thin set mortar, and your KERDI waterproofing membrane overlaps onto it creating a continuous waterproof envelope from the shower walls all the way into the