Products HRP (for OEM) HRP Series High ResolutionDC Metering PumpsDesigned specifically for OEM applications, the HRP pump has been sized for easy integration into many types of systems. Key Benefits:High Resolution/Ultra compact 4″ x 2.5″ x 3.5″Digitally controlled stroke rate 0 to 720 SPMIP65 waterproof and dustproof designDC voltage operationPVDF pump head with ceramic balls and FKM elastomer4 types of control:Pulse4-20 mA1-5 VDCStart/Stop