Webasto's Koolair Seawater SPM 1000 Pump is magnetically driven with no shaft seal.The pump is designed for continous operation and is epoxy encapsulated, which allows the PM pump to run fully submerged in many liquids or in open air for complete moisture protection.Perfect for gasoline engine room installationsHardened graphite impeller bushing rotating on a ceramic shaft creates superior run-dry protectionThermal overload protection shuts off the pump until it cools down in the event of extended dry run*Full one-year limited warranty*After the pump completely cools down, it will automatically reset and resume operation.