This is a high-density polyethylene aspirator pump that operates on water pressures above 11 psi (7584 N/m2). The integral check valve resists corrosive filtrates and fumes. A quick-disconnect hose fitting accepts 6.4mm to 9.5mm (1/ 4" to 3/8") I.D. tubing. The male thread faucet connection is 9.5mm (3/8") I.D. Maximum attainable vacuum is 696mm Hg (27.4") with a flow of 6 liters (1.5 gal) per minute.