Maric Flow Control manufacturers fixed flow control orifices that maintain a pre-set, constant flow rate regardless of pressure even while the upstream and downstream pressures are changing. Established in 1963, Maric flow controls are engineering and manufactured in Adelaide, Australia and offer valuable protection for flow rate sensitive equipment, processes or distribution systems. The technology is based on a precision molded rubber control ring in the body, with an orifice diameter that varies in response to the pressure differential applied to it, the greater the pressure, the smaller the orifice, and vice versa, therefore maintaining a constant, pre-set flow.