Marketing InformationAll mti rectangular and corner tubs are available with a factory installed pre-leveled frame and foam base. The pre-leveled frame system eliminates the need to frame along the walls and use wet bed compound to level the tub. The frame and foam base are typically used for alcove installations, although mti can recess one or more ends of the tub for custom applications. When adding the pre-leveled frame to a tub with an end drain, you must specify which side (left or right) the drain will be on in relation to the recessed side where the skirt is to be added.