Exact Fit for Popular RV Furnaces: This 230849 L175-30F furnace limit switch is engineered as a direct replacement for NT-16SE, NT-20SE, NT-24SE, NT-30SE furnaces and Mach 1997 RV heaters. It replaces part numbers 3105-3351 and 3105-3351A, helping restore reliable heat output to and motorhome systems. Restores Safe Temperature Regulation: Designed with precise L175-30F thermal calibration, this high temperature limit switch monitors furnace heat levels and cuts off operation when limits are exceeded. It supports consistent performance, helps prevent overheating damage, and maintains , more efficient operation of your RV furnace during cold-weather travel. Straightforward DIY Replacement: The direct-fit design of this and furnace limit switch allows most RV owners to complete installation quickly with basic hand tools. Simply disconnect power, remove the old switch, and install this replacement in the same mounting position to get your RV furnace running again. Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.