Portable, hand operated pump easily generates 300 psi (20 bar) without electricity or compressed air. Light, compact pump can be easily transported to remote locations. Fine adjustment piston allows the user to achieve an exact pressure for cardinal point pressure calibrations. Precisely vent pressure with soft seated bleed valve Quick-disconnect gauge adapter allows changing test gauges without using a wrench. Low volume Quick-test hose, gauge adapter and process connection can be attached to pump without thread sealant or a wrench Rugged, all metal construction improves temperature and pressure stability Made in U.S.A.