Official Venstar ACC0410 Add-A-Wire Installation (See Description for Updated Video) - YouTube
Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostats (4 to 5 Wires), White - Amazon.com
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Newbie: Any way to add a c wire to existing transformer or wires? Do I need a new transformer with a “c” terminal? (Trying to connect a Wi-Fi thermostat to control boiler) :
Nest 2nd Gen add C and * wire - DoItYourself.com Community Forums
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Add-A-Wire Accessory, Briidea Common Wire Kit for All 24VAC Thermostat
Adding Venstar Add-a-wire to HVAC - Home Improvement Stack Exchange