Compatible Model:Fits for Atwood Hydroflame RV Furnaces.Suitable for 1522 2 STAGE, 1522 LD 2 STAGE, 2334 2 STAGE, 8516-III, 8516-IV, 8520-III, 8520-IV, 8525-III, 8525-IV, 8531-III, 8531-IV, 8535-III, 8535-IV Models. Function: 190℉ limit switch has the function of preventing the furnace from overheating, when the temperature of the furnace chamber is too high, the limit switch will shut down the burner in time. Superior Materials:190℉ Limit switch is made of high end aluminum alloy and thermoplastic material for strength, longer service life, ruggedness, thermal sensitivity, and can withstand high temperatures.