FLEX-PRO® A4 benefits include: Outputs to 171 GPH/648 LPH, 2500:1 turndown ratio and continuous feed; Output Pressure ratings to 125 psi/8.6 Bar; Automated PPM Dosing; Operator friendly digital touch pad with menu driven software; No maintenance brushless variable speed motor; Patented Tube Failure Detection System; Pump tube in Norprene or Tygothane meets FDA requirement for food; Meets 3A sanitary standards; NEMA 4X/lp 66; Heavy duty single piece rotor; LCD displays motor speed, input signal values, service and alarm status; Inputs include: 4-20mA, 0-10Vdc, and Pulse Signal inputs for external speed control, 30 VDC contact closure for remote start/stop, equipped with multiple analog and digital I/Os for SCADA system connections; Self priming even against maximum line pressure, Bypass valves NOT required. Won’t vapor lock or lose prime.