Automatic operation with continuous grease discharge with the trigger pressed Ideal for use in factory maintenance, agricultural applications, fleet service or for use on trucks connected to vehicle air brake compressors Heavy-duty aluminum die cast head with internal bore precision honed for rapid action. Head fitted with bulk loader valve Ergonomic pistol grip and acute angle design allows for ease of operation, especially in narrow spaces Air Operating Range: 40 to 120 psi Pressure Ratio: 40: 1 Air Compressor Volume: 1 CFM/0.026 cu.m & above Each gun is supplied with a male quick coupler fitting. Air Inlet Thread 1/4 NPT. Multiple Loading: 14 oz. Cartridge/Suction/Filler Pump Complete with 12 flexible hose, 6 steel extension fitted with professional 4-jaw coupler Warning: Air supply must be totally dry and ALWAYS use lubricator unit.