A Solenoid Metering Pump with Stroke Length and Frequency adjustments, for 100:1 turn down. Available with proportional 4-20mA input, dry contact external pacing or standard manually controlled dosing from 3 GPD @ 300 PSI to 600 GPD @30 PSI. Available in PP, PVC, PVC Degass or PVDF materials and CSPE, Viton or TFE seals with Ceramic check balls; contact us for other material needs. Each pump is complete with bleed valve, tubing, foot valve and 1/2"NPT injector to complete any installation.