Continuous air-powered grease gun designed for heavy use in agricultural, industrial or fleet settings. Grease pressurizes up to 4800 psi. Air operating range of 40-120psi (40: 1 pressure ratio) with an air compressor volume of at least 1 cfm. Threaded female air Inlet 1/4 inch wide (each gun supplied with a male quick coupler fitting). head die cast from heavy duty aluminum with bulk loader Valve for quick filling. Accepts 14 oz. Cartridge or 500Cc bulk. Gun complete with 6 inch steel extension and professional 4 jaw coupler. Use in automotive, industrial, agricultural, and construction settings.