Drive Air Adjustment Screw, to fit A-dec; Pkg of 3Fits Century II control blockFits Century Pac control systemFits handpiece control valve 22.0770.00Package of 3A-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.