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A.O. Smith part numbers
9 A.O. Smith part numbers have pages on HVAC Fitter, in 4 part types: hot surface igniters (4), flame sensors (3), furnace pressure switches (1) and thermocouples and thermopiles (1).
Each page shows the specs from the maker's and parts sellers' listings for that number. Match them with the label on your old part.
A.O. Smith part types
4 part numbers
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