Schluters design also takes into account installation simplicity without sacrificing performance. The kit includes preformed KERDI-KERECK waterproofing corners and seal components like the KERDI-SEAL-PS pipe seal and the KERDI-SEAL-MV mixing valve seal, making for a more complete system out of the box. Though the grate is sold separately, this flange acts as the foundational interface between your waterproofing membrane and your drain grate, giving you the flexibility to choose a grate finish that complements your tile aesthetic.