Williams Furnace Company 9940 Hard-Wire Converter For use with 3508231, 3508232, 3508631, 3508632, 4007331, 4007332, 4007731, 4007732, 5008631, 5008632, 5507331, 5507332, 5508231, 5508232, 6008531a, 6008532a, 6007731, 6007732, 6508631 and 6508632 Used for wiring from a junction box rather than using the power service cord on all Williams' forsaire counter-flow furnaces Easily installs in place of the power cord