S Variable Series Variable Speed Peristaltic Metering Pump. 3.0 – 60 GPD maximum output @ 25PSI Maximum Pressure. 20:1 Turndown Ratio. Includes Santoprene peristaltic head tubing with 1/4″ connections. 120V/60Hz. S3QP Pump head, #4 Santoprene 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.