New Janitrol Aircraft Heater p/n 65D79-2, Piper Navajo PA-31. We found this in an inventory we purchased. Heater has never been installed but does NOT come with any paperwork. The heater is a 24 volt unit, heater does have a slight dent in the shroud from being moved around on the shelf. (see pictures). We believe that this heater will fit in 1974 to 1979 Piper Aircraft Model PA-31 Navajo with serial numbers 31-7552033 through 31-7552036 and also serial numbers 31-7552039 through 31-7552050.