Bel-Art Vacuum Aspirator Polyethylene Pump with Quick Disconnect Hose Fitting (F32947-0000) High-density polyethylene aspirator pump operates on water pressure above 11psi (7584 N/m2) Integral check valve resists corrosive filtrates and fumes Quick-disconnect hose fitting accepts 6.4 to 9.5mm (1/4 to 3/8") I.D. tubing Male thread faucet connection is 9.5mm (3/8") I.D Maximum attainable vacuum is 69.6cm Hg (27.4") with a flow of 6 liters (1.5 gallons) per minute