This is a replacement board for Atwood Hydroflame RV furnaces that specify Atwood P/N 31501 or 33488. It is a PCB board powered by 12V DC, sending a signal to open the gas valve and emitting a high output voltage to generate ignition sparks to ignite the burner. It is suitable for various furnace models, including 7912-II, 7916-II, 7920-II, 8012-II, FA 79D, HF 80D, and more.