MACROY Series metering pumps from Milton Roy are designed for applications up to 175 psi, including water-treatment chemicals, process additives, acids, out-gassing fluids and slurries. The drive incorporates a variable eccentric design that enables smooth output and reduces system shock. The mechanically actuated diaphragm reduces the risk of hydraulic oil contamination of process liquid. DC variable-speed drives are available for external control and automation. The pumps have flow rates up to 310 gph; a durable, metallic powder-coated housing; high-performance check valves with machined seats; precision stroke adjustment while the pump is running or stopped; and increased turndown ratios available with variable-speed options. 800/693-4295; www.miltonroy.com.