Pistol Grip Heavy Duty Grease Gun, 14.5 oz Cartridge, 18 in Whip Hose Coupler ORS NASCO Precision made of flexible heavy duty Precision made of flexible heavy duty fiberglass with embedded 308 and 308L stainless steels Very similar to type 308 but has a carbon content held to a max of 0 resilient and impervious to lubricant Extra heavy follower spring insures positive priming and uninterrupted pumping action Rugged cast pump head for strength and durability Jam proof toggle mechanism prevents binding or accidental bending of plunger Exclusive “Flip Over" follower allows a superior seal for either cartridge or bulk loading applications Tough