OLD NEW STOCK. Quantity: 8. Electro-Guard, Inc. Model 620A Kit - Impressed Current Cathodic Protection System. This impressed current cathodic protection system provides totally automatic protection and STOPS CORROSION IN ITS TRACKS! For boats with aluminum I/O drives, aluminum jet drives, large outboard motors & aluminum hulls to 30' LOA. Complete installation kit includes: 620 controller, two color LED display, reference cell & ceramic coated, titanium anode.