The Rinnai 807000185 Water Heater Water Pressure Sensor Assembly monitors water pressure within the water heater to support proper operating conditions. This sensor assembly detects pressure changes in the water flow and sends corresponding electrical signals to the appliance's electronic system for monitoring and regulation. It assists the heater in responding to pressure variations ... https://www.hnkparts.com/807000185-rennai-water-pressure-sensor-assembly/4-807000185.html