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White Rodgers EMERSON 50A66-843 Furnace Control Circuit Board FREE SHIPPING. Condition is Used. Shipped with USPS Priority Mail. Item in good tested condition. Please check your existing gas furnace to make a match. If you have any questions or issues with your product please contact me immediately I had a customer give me negative response because he installed the wrong circuit board on his furnace and did not contacted me first. Thanks for looking PayPal please.