Series 660/680 WOB-L piston pumps from Thomas are suitable fora variety of medical and environmental applications, including oxygen concentrators, blood analyzers, dental carts and ozone generators. The pumps' oil-less pistons and cylinders, plus efficient intake filters, are said to ensure a non-contaminated air flow. The pumps provide up to 28.5 in. Hg of vacuum, or 45 psi of pressure.0
Maximum flow is rated at 2.37 cfm.