This basic unit disposer comes with a 1-1/4 hp motor and has aluminum grind and discharge housing. The disposer has no feet with a short upper housing. Its dual directional grinder, which is controlled by the operator when installed with Control Groups 2, 3, or 4, help prolong the life of the disposer by alternating directional uses. A chrome plated brass tail piece is provided for connection to a 1-1/2'' standard drain trap. The Ni-Resistant flywheel is 6-3/16'' in diameter and functions to prevent objects from 'riding' at the center of the disposer. Two stainless steel cutter blocks fastened to the flywheel with nylock screws are replaceable. For more information see the above PDF file.