These simple-to-use aspirator pumps create a strong, pulseless vacuum for an economical price. The OAKTON aspirator pump features an air suction rate of 12 to 14 liters per minute at each of its two ports. These portable instruments contain a built-in circulating pump that continuously forces water across a series of venturies for quiet, clean, and efficient operation. Use the built-in water tank to eliminate water waste, or connect the pump to a faucet for continuous water feed. These pumps have a two-compartment design that allows easy access to the water tank. Choose from pumps with either an economical polypropylene tank or a rugged stainless steel tank. OAKTON aspirator pumps are supported by a full selection of accessories. Two independent suction ports have an air suction rate of 12 to 14 liters per port. Maximum attainable vacuum is 29.5" Hg. Uses 3/8" ID x ¼" wall vacuum tubing for connections. Net weight of 27lbs.