Rheem-Ruud SP20172 Sensor Kit whereas other models in the

whereas other models in the series target 120V or low-voltage 24V applications

this specific Watts 0780021 is exclusively for agricultural water float valves

Honeywell 4074EVK Short Shaft Kit

Its 24V DC coil design ensures seamless integration with standard low-voltage control boards and 24-volt transformers

preventing localized boiling or bypass leaks that can lead to catastrophic unit failure

Rheem-Ruud SP20172 Sensor Kit whereas other models in theThe Rheem Ruud SP20172 Sensor Kit is the essential OEM replacement for managing flammable vapor ignition resistance (FVIR) in gas fired water heaters. Designed as a direct supersession for AP13447 3, this flammable vapor sensor (FVS) monitors the environment for volatile substances, triggering a safe shutdown via the gas control valve if high concentrations are detected. A common indicator for a malfunctioning or tripped sensor is the seven flash