Cover Kit, to fit A-dec® Century® II, Control Block, Holdback Valve (A-dec® #90.0304.00) Includes cap, diaphragm, screws and o-rings Fits 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.