Immersion style heater preheats oil in wet sump oil pan or dry sump tanks to reduce overall warm up time and improve lubrication during initial start up. 5/8" diameter stainless steel sleeve inserts into pan or tank and secures with a welded on 1/2-14 NPT brass screw-in fitting. 120-volt operation. WARNING! Do not plug heater into electrical outlet without being installed in tank and submersed in liquid, element heats up quickly and damage will result.