Close the gap with our innovative injection molded operating diaphragms. These easy to assemble kits turn a string of passenger cars into a train. Diaphragms stay connected in turn radii over 24 inches and have no minimum radius for smooth operation. Diaphragms are designed for Kadee #5, Intermountain and McHenry couplers unless otherwise noted. Instructions are included with all kits including help with installing diaphragms on brass and other cars. Includes car end doors, uses Kadee #23 couplers.