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If you give me the actual model number of your unit (it should be on the rating tag inside the burner compartment) I might be able to find one for you online or you'll have to go to a local HVAC supply house that sells Rheem. But just because you get an open pressure switch code doesn't mean the switch is necessarily bad. You could have a blocked exhaust vent. It's pretty common fr insects to build a nest in the exhaust over the Summer.