Solinst Peristaltic Pumps are designed for vacuum pumping or pressure delivery of liquids or gases. They are ideal for sample removal from shallow wells and surface water. The mechanical peristaltic operation is effective to depths of approximately 33ft or 10m at sea level, limited only by the suction lift limit which varies with elevation. The Solinst Peristaltic Pump has variable pumping rates and can be fitted with 2 different sizes of silicon pumphead tubing. With the 3/8" OD (10mm) tubing the pump delivers a sample rate as low as 40 ml/min and up to 900 ml/min. If the 5/8" OD (16mm) tubing is used, it delivers from 120 ml/min to almost 3.5L/min.