This is a Brand New Rheem/Weather King/Ruud/Corsaire 3" Main Limit Switch rated at 150 Degrees (L150-20).  The Part number is 47-25349-03 (also replaces 47-22679-03, 47-25349-03, 47-25349-02, 47-22695-02, 47-22696-02, 47-22679-02, 47-25351-02, 47-25349-02, 47-22695-03, 47-22696-03, 47-25351-03).  This Limit Switch goes on many Rheem/Weather King/Ruud/Corsiare furnaces- if it looks like your limit and your limit switch, is approx 3" long, and has the same Temp. ratings, then this will work for you!!  It will also fit some other systems with the same Temperature rating/Length!