Proma offers the flexibility of right/left delivery systems with 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. The A5220 with the Euro-style delivery includes compass chair bracket and hardware, and vertically adjustable counterbalanced arm with air-actuated lock. Proma units to be mounted on Royal Domain or Alliant chairs can be ordered with an internal umbilical. Please specify internal umbilical when ordering unit. The Euro-style is an option for the provider who would rather have the unit delivery trans-thorasic, and a whip arm to help set the handpieces back to the unit.