The General Pump 100687 is a 12 Volt Double "A" Groove Clutch Adapter Kit for 47 Series Pumps. The mobile clutch in typical water pump applications, the clutch is mounted on the input shaft of the water pump. Since the clutch has an integral puller, a belt is used as the input to the clutch. This belt is normally driven directly from an electric motor or a gas/diesel engine. When there is no power to the clutch, the water pump does not engage; however when power is activated, the clutch drives the water pump to initiate water flow. In this application, the General Pump clutch is mounted directly to a General Pump by using an adapter plate. A General Pump Mobile Clutch Design Advantages is that it has a Solid Forged Rotor: A one-piece solid forged rotor means no chance of internal parts separation. They have an even wall thickness around the coil which gives optimum flux distribution, maximizing torque.