High speed system and mechanism for selecting a vial or vials from a series line of vials driven in a given spaced relationship into a capping and sealing mechanism, wherein detection signals are taken in a seal force monitor according to preset criteriae such as bottle configuration and efficiency of capping and sealing, and a vial acceptance or rejection device is operatively tied in to the seal force monitor on a screw feed mechanism, the vials being advanced by a screw feed mechanism into pockets in rotating starwheels, gripper fingers are positioned in conjunction with the starwheel and operable by cam means selectively operated by a signal from the monitor to indicate that a specific vial is to be rejected, the gripper fingers being designed to snap around and hold the vial as long as required, a secondary cam being used to drive the gripper fingers back to a normal inoperative position and/or to release a selected vial to be rejected and deposited into a special path, the secondary cam being further designed and used to include a short movement of the gripper fingers for assuring release of non-selected vials into a selected path for ultimate subsequent disposition.