CCC II Multi-Zone Kit

CCC II Multi-Zone KitMultiple Zone Comfort Control Center II Thermostat Relay Control Box. For use with 10-button CCC2 thermostat (sold separately).Will work with the following Upper Unit Model Numbers: B57915, B59516, 459186, 459530, 541815, 541816, 551816, 640315, 641815, 641816, 641835, 651815, and 651816.