^Cast aluminum head and enclosed piston assembly. ^Jam-proof handle return mechanism. ^Includes both h/d 18" flexible hose with coupler and rigid 4" tube. ^Filler nipple / bleeder valve combination. ^Variable stroke design delivers high pressure & high volume. ^Extra heavy follower spring ensures positive priming & uninterrupted pumping action. ^Exclusive flip over follower eliminates grease bypass. ^Three-way loading: cartridge suction or bulk. ^Develops up to 7500 PSI (517 Bar).