Price: $18.99
(as of Feb 18, 2026 10:58:40 UTC – Details)
★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
