S Variable Series Variable Speed Peristaltic Metering Pump. 7.5 – 150 GPD maximum output @ 25PSI Maximum Pressure. Includes Santoprene peristaltic head tubing with 3/8″ connections. Ball Check Valve with Tantalum Spring, FKM Seat & O-Ring. 120V/60Hz. S4QP Pump head, 5X Pump tube. Operates at the customer set speed when power is applied, or the standby input is removed unless potentiometer is set to OFF. Backup pump capability, Tube leak detector, Totally enclosed housing, NEMA 4X, Tube replacement without tools.