The clean, contemporary look of the KOHLER® Groove shower base brings sleek style to the bathroom. Featuring a recessed rear drain, this rectangular 48" x 36" acrylic base offers a low-threshold design for easy access. Add a removable aluminum or teak cover over the recessed drain for a finished look. Kohler® Shower Receptor, Single Threshold, Groove®, 48 in Length, 36 in Width, 4-1/4 in D, Recessed Rear Drain Location, 3-3/8 in Diameter Drain Hole, 20 psf Minimum Floor Load, Acrylic, Biscuit