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
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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
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First Listed on Newegg
June 30, 2026
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