Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 wires), White-Fast Shipping

Description

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