KOHLER K-9925 Groove 48" x 36" alcove shower base, rear center drainThe clean, contemporary look of the Groove shower base brings sleek style to the bathroom. Featuring a recessed rear drain, this rectangular base offers a low threshold design for easy access. Add a removable aluminum or teak cover over the recessed drain for a finished look. Low threshold design for easy entry and exit Recessed rear drain Single threshold for three wall installation Requires K 9332 Groove aluminum drain cover or K 9336 Groove teak