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On Line Controls, Inc. has been suppling air regulation for plastic extruders for over 25 years. Our highly-reliable ultra low air pressure regulators and controllers have a life-expectancy of 10-20 years. By regulating air pressure to a set point during the manufacture and extrusion of tubing, our MicroAirs provide precise air sizing and control the outside diameter. Manual control, auto control, and multiple channels available. In 1999 On Line Controls acquired the motorized potentiometer line and has continued the tradition of providing dependable high precision proportional controls for automating analog driven devices.