Fast-Stat Common Maker Thermostat Wire Extender (Adds a Common C Connection)

The Common Maker adds a common C connection to a thermostat cable with 2 or more wires. A common connection allows the thermostat to operate without batteries or power stealing circuits. Compatible with all major name brand Wi-Fi thermostats and HVAC equipment, including furnaces, air handlers, zone valves, zone controllers, millivolt systems, and more.