A Solenoid Metering Pump with Microprocessor Controlled Stroke Frequency and manual Stroke Length adjustments for 1000:1 turn down. Standard with proportional 4-20mA input, dry contact external pacing or standard manually controlled dosing from 3 GPD @ 300 PSI to 504 GPD @20 PSI. Available in PP, PVC, PVC Degass, PVDF or 316SS 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.