Kohler shower and Tub Seat Design The function of the shower seat and tub seat is basically the theme, however the design is different, shower seat can be separated with the shower. It needs three-wall space for shower to get shower seat, but another design of shower seat is integrated with the drain that can be installed in front of the shower, however it also thresholds three-wall space for the shower. The design of the separated shower seat is usually integrated with tile in flange with the curve suitable for beck. This is good for those who needs simple put of comfort. Bathroom.