Q.D. Plug, Control Block, to fit A-dec 300/500®; Pkg of 5 For A-dec 500® & 300® Series Package of 5 (A-dec® #026.160.01) A-dec®, A-dec 500® and A-dec 300® 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.