The Sigma/ 1 mechanically actuated diaphragm metering pump from ProMinent Fluid Controls is capable of flow rates from 5.3 to 38 gph and pressures up to 174 psig. The product range, control type S1Cb/S2Cb/S3Cb, comes with a removable HMI operating unit for complete system integration. It is available in a basic (non-microprocessor based) version and in explosion-proof models. 412/787-2484; www.prominent.us.