Ingersoll Rand”s ARO Pro Series of diaphragm pumps now includes two- and three-inch ported metallic models. Previously offered only in aluminum, the pumps are available in cast iron and stainless steel. The addition of these additional materials for the two- and three-inch models means ARO now offers all three materials for all port sizes in its Pro Series portfolio. Like their aluminum counterparts, the new models feature patented air-valve technology that eliminates pump stalling by utilizing an “unbalanced” design. By creating an optimal pressure differential, air valves do not center, even under low air inlet pressures. The unbalanced valves are designed to reduce production loss and downtime by providing better shift signals and delivering faster trip-over with more flow (172 GPM and 237 GPM, respectively, for two- and three-inch models). With bolted construction and a variety of material options, the pumps are designed for leak-tight integrity and chemical compatibility. O-rings and U-cups prevent air leakage by providing a positive seal as the air valve shifts; air flow stops when the fluid flow stops. ARO Pro Series diaphragm pumps are backed by a five-year warranty on materials and workmanship. More information on industries and applications can be found online by visiting Ingersoll Rand”s Fluid Technologies Productivity Park at