The pumps' oil-less pistons and cylinders, plus efficient intake filters, ensure a non-contaminated air flow. Stainless steel valves, high-performance piston seals, hard-coated aluminum cylinders and permanently lubricated bearings offer long-life performance. Wetted aluminum parts are treated for corrosion protection. The pumps' single-phase AC motors are of ultrareliable permanent split capacitor design, which eliminates the need for a starting switch.
Series 660/680 pumps provide up to 28.5 in. Hg (-965 mbar) of vacuum, or 45 psi (3.1 bar) of pressure. Maximum flow is rated at 2.37 CFM (67.1 LPM).