Abstract: The invention is a garbage disposal that includes a dishwasher drain connection to allow water and waste to enter the disposal from a dishwasher, a water input port also to allow water to enter the disposal, a valve associated with the water input port to block the flow of water through the water input port until the valve is actuated, and a switch assembly to actuate both the disposal and the valve. In one embodiment of the invention a coupler is connected to the dishwasher drain connection, where the coupler accepts both a dishwasher drain hose and a water supply hose, so that the dishwasher drain connection acts as the water input port. Another embodiment of the invention includes a coupler adapted to be installed on and modify existing disposals according to the invention. The invention also includes a method of modifying garbage disposals according to the invention.