... Adjustable from 0-1000l/h @ 1Mpa;>>Hydraulic diaphragm metering pump;>>With built-in automatic venting, pressure release and automatic oil feeding valve;>>Enhanced ... performance;>>High efficient inlet and out let check valve assembly;>>Pump body can be made of PVC, PTFE, 304, 316, ... , Chemical, Metallurgy, Water Treatment, Nuclear, Medicine & Food industries, etc. double head diaphragm metering pump