The Rinnai 104000207 Water Heater Hex Thermistor Kit is a replacement part for various Rinnai water heater models, including R75, R94, V53i, RC80e, and i. 1 It is a genuine OEM part designed to ensure optimal performance and safety of your water heater. https://www.hnkparts.com/104000207-rennai-kit-hex-thermistorr75r94v5