MPGA075B4B ducane pressure switch

I NEED TO ORDER A PRESSURE SWITCH FOR A DUCANE FURNACE BUT NOT SURE WHICH ONE I NEED. THE MODEL NUMBER IS MPGA075B4B AND THE SERIAL NUMBER IS 8458100634. ANY HELP WOULD BE APPRECIATED.

Hello,
Thank you for your question. Here is a link for the replacement part:


http://www.northamericahvac.com/lennox- ... -40-wc-pf/


Please let us know if you have any other questions. Thank you!