The Cole Parmer MasterFlex L/S Economy Peristaltic Pump offers users a reliable, trusted pump that’s IP22 rated. The Cole Parmer Masterflex L/S is powered by a 1/20 hp unidirectional motor, that spins counter clockwise. This Economy Variable-Speed Drive is sturdily constructed with a painted steel housing rated for protection from vertically falling water and simple controls set in the front. This Cole Parmer Pump will accommodate 1 pump head such as Standard, Easy-Load, Easy-Load II, Easy Load 3. This masterflex peristaltic pump has a wide flow range, between 1.2 and 2900 mL/min, with a speed range of 20-600 RPM with a soft start and back EMF for ±5% speed control.