24Volt Transformer C Wire Adapter for Thermostat and All Versions of Ring Doorbell, Compatible with Nest, Ecobee, Honeywell, Sensi, Sensi Smart WiFi Thermostat, Nest Hello Doorbell Supply Cord: Amazon.com: Tools & Home
Mini Cooper N16 N18 Thermostat Adapter Wire New OEM 12518614952 13-16 – ALLMAG Auto Parts
24Volt Power Adapter/Transformer,C-Wire Adapter Thermostat,Compatible with Honeywell,Ecobee,Nest and Sensi Smart WiFi Thermostat Pro(25Foot /7.6M Cable) - Amazon.com
iO HVAC Controls UT-SWM Universal Thermostat Smart Wire Module Wire Module With 2 to 5 Wire Adapter.
Honeywell Home C-Wire Power Adapter Selectable-flexible 24-Volt Programmable Thermostat Square in the Programmable Thermostats department at Lowes.com
Motion Raceworks Billet LS Thermostat Adapter (12AN/16AN/20AN)
24Volt Power Adapter/Transformer,C-Wire Adapter Thermostat,Compatible with Honeywell,Ecobee,Nest and Sensi Smart WiFi Thermostat Pro(25Foot /7.6M Cable) - Amazon.com
TracTuff K Series Thermostat Port Adapter | TracTuff
Automotive Radiator In-Line Coolant Hose Fitting Water Temperature Adapter Electric Fan Thermostat Switch - Walmart.com
Doorbell Transformer,AC 24V 500mA C Wire Thermostat Power Adapter,315" Long Cable 24V Power Supply - Walmart.com
HQRP 24V AC Adapter Transformer Works with Ecobee Nest Honeywell Emerson Ecobee4 Smart WiFi Thermostat C-Wire - Walmart.com
Aowel 24 Volt Transformer, C Wire Adapter for Smart Thermostat or Doorbell Transformer, (UL Listed) - Amazon.com
Low-Profile Oil Cooler Thermostat for LS Engines
LIANSUM 24V 500mA C Wire Adapter for Thermostat and Doorbell Transformer, Compatible with Nest, Ecobee, Sensi, Honeywell, Sensi Smart WiFi Thermostat, Nest Hello Doorbell, Ring Doorbell Supply Cord - Amazon.com
Honeywell Home C-Wire Adapter White CWIREADPTR4001/E - Best Buy
Ingers 24V 500mA C Wire Transformer Adapter for Thermostat and Doorbell, Compatible with Nest / Ecobee / Sensi / Honeywell Thermostat, Nest Hello Doorbell / Ring Doorbell Power Supply - Amazon.com