1Strong Compability: The control board is compatible with Atwood Dometic 91504, 91420, 91606, please confirm whether your model is applicable before buying. 2Replace Number: The manufacturer number for reference is 91504, please confirm whether it is consistent with the number you need. 3Upgraded Design: The control circuit board adopts advanced design and intelligent management to improve the use experience. 4Strong Stability: Ignition control board adopts excellent electronic components, Smt technology, Pcb files to ensure the stability of product performance. 5High Standard: Circuit board replacement adopts Oem production standard, which can be perfectly adapted to Rv water heater circuit board replacement.