DC Transfer Pumps For Gasoline and Diesel Oil self-priming rotary vane pumps feature a mechanical seal that guarantees constant reliability, even in low temperatures. Cast-iron pump casing, treated against corrosion and paint-finished. Vane pump with steel rotor. Mechanical seal. Bypass valve built into pump casing. Induction motor with aluminium casing. Grade of protection: IP 55. Continuous running. 1" Threaded joints on pump casing.