Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 wires), White - Product Features
- Makes one wire works like two
- To add a common wire to a 4-wire system, or to add cooling to a heat-only system
- For use with all 24VAC systems
- Includes yellow, green, blue wire splice (directionally sensitive)
- Cannot be used as ''R'' power or ''C'' common wire