State-of-the-art technology, available in a value price range. Specify manufacturer and model number of chair, also manufacturer and model of light (if required). Proma units to be mounted on Royal Domain and Alliant chairs can be ordered with an internal umbilical when ordering. The Proma unit has the proven reliability of a pinch valve block system. The pinch valve system is so reliable that Proma gives a lifetime warranty on the whole block system. Note: The Value Line is available in right-hand configuration only. The A6340 is a combination doctor's unit and assistant's package with vacuum arm.