1Strong Compatibility: Control board is replacement for Suburban SW4D, SW6D, SW6DE, SW6DEL, SW6DEM, SW6DM, SW6 and SW10, for all suburban furnace and water heater circuit boards. 2Part Number: Water heater circuit board replace part number are 520871, 520814, 520820, 33550L, AP4896608 for reference. Please check the number before ordering. 3Stable Control: The board ensures a stable ignition process, guaranteeing the normal and consistent operation of the water heater. This feature minimizes the risk of potential safety hazards. 4Enhanced Safety: With its reliable ignition control, the board effectively prevents any potential safety risks associated with the water heater, making it a safe and dependable choice for your Rv. 5Simple Installation: Designed with easy installation in mind, the control board can be conveniently integrated into your existing water heater system without any hassle.