Product Description Product Reviews OTC 2304 Professional Pistol Grease Gun Heavy duty die cast aluminum grease gun head with integrated die cast fixed handle. Grease gun head fitted with automatic air bleeder. Large diameter piston for working in cold. Built-In variable stroke for greasing fittings with limited access. Includes 4" straight steel extension, easy access 24" high pressure grease hose and 3 Jaw slim coupler. 7500 PSI. For use with 14 oz. grease cartridge.