Cover Kit, to fit A-dec Century II, Control Block, Holdback ValveIncludes cap, diaphragm, screws and o-ringsFits A-dec Century II control block #38.0223.02 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.