Drive Air Adjustment Screw, to fit A-dec®; Pkg of 3 Fits Century® II control block Fits Century® Pac control system Fits handpiece control valve 22.0770.00 Package of 3 (A-dec® #29.0100.00) A-dec® and Century® are a registered trademark of A-dec, Inc. DCI has no affiliation with A-dec and A-dec has not authorized DCI replacement parts to be used on or in connection with A-dec® products.