Equipment Interface Module, Compatible Brand and Series RedLINK, TrueZONE, Compatible Grainger Part Number 3RCL7, 3RCL8, Compatible Manufacturer Model Number HZ322, HZ432, THM6000R7001, THX9321R1008, THX9321R5000, Function C-Wire Adapter, Includes -, Key Features Communicates with Wireless Outdoor Sensor, Overall Depth 1 1/4 in, Overall Height 5 9/16 in, Overall Length 4 3/8 in, Wireless System Compatibility RedLink, Gray, Terminal Designations A, B, C, D, 18 to 30V AC, Wireless Yes