3 Year old A.O. Smith Gas Control Valve removed from an operational A.O. Smith HW-670 water heater. Was getting a fault code and hired a A.O. Smith recommended technician to troubleshoot the water heater. A.O. Smith suggested that he replace the Gas Control Valve and Ignition Control Module, only to find out that neither was the issues after 00 in parts! I couldn't return the new Gas Control Valve because it had been installed so I'm selling this one. Guaranteed to work on installation or your money back.