Atwood 31501 Circuit Board IGNITER replaces Hydroflame 33488 Atwood 31501 Fenwal 35-535911-113, Direct Spark Ignition Control designed for use in Atwood RV gas furnaces, Replacement Part IGNITER replaces Hydroflame 33488 Atwood 31501 Fenwal 35-535911-113 ADAPTER BOARD 33727 makes this kit compatible with pre-2004 furnaces using Atwood Edge Connector style board 37875. ADAPTER INCLUDED allows for direct replacement of the furnace control RC CIRCUIT BOARD. The control board carries UL and CSA certification listings, unlike other aftermarket replacement controls that have limited or no safety agency certifications. UTILIZES a MICROPROCESSOR to continually and safely monitor, analyze and control the proper operation of the gas burner