Profile: MacMillin Hydraulic Engineering Corporation designs and builds custom hydraulic assemblies. We offer factory parts and service on components and accessories. Our products include rotary actuators, hydraulic reservoirs, heat exchangers, suction strainers, pressure gauges, flow controls, piston pumps, pressure & proportional control valves, pump/motor adapters, needle valves, hydraulic valves & components, gear pumps, hoses & fittings and flow meters.