VEVOR 1 Inch NPT Automatic Fuel Nozzle with Swivel, Max Flow Rate 21.6 GPM, Auto Shut Off Diesel Gas Pump Nozzle with 3-Speed Trigger Lock & 1-3/16 in (OD=30.1 mm) Spout for Gasoline, Diesel, Kerosene

Dear Customer, Thanks for your inquiry. No, it must be driven by an oil pump. The pressure is not enough when flowing down from a high place, and the oil gun cannot be opened.