A syringe assembly for an inflation control system having a mounting head at one end is pivotally mounted in a mounting bracket for engagement with a drive arm. The mounting bracket is stationary in relation to the drive arm of the system. The mounting head includes a lateral projection on each of its sides having a shape and size selected for pivotal engagement with notches formed in side walls of the mounting bracket. The handle of the syringe plunger includes a driver retainer for capturing the drive arm in the longitudinal directions so that the longitudinal plunger movement is controlled by the drive arm. Neither the retainer nor the drive arm limits movement in the normal direction so that the syringe can be easily separated from the drive arm by an operator. A clamp secures the syringe barrel in the normal direction. Overcoming the force of the clamp is facilitated by the mechanical advantage provided by the pivotal mounting arrangement of the syringe assembly.