I've been working on a outdoor gas log fire pit. Needing a new thermocouple. In twenty yrs of working on fireplaces I can only remember seeing once before. The gas log has no Mod or Ser or even a name on it anywere. The thermocouple has coarse theard and is slightly larger. In the picture below the top thermocouple is the one in question the bottom is a typical honeywell thermouple. If anyone has any ideals I would appreciate the help.