Usage Tips:Compatibility: Limit Switch Fit for Furnace. Replace Part Number: Replace 20162904, L40-524. Before purchasing, please carefully check the product information Durability: Made of quality materials with high mechanical strength, it has excellent heat resistance and durability, to withstand long term high temperature and frequent use Function: Featuring high-precision temperature control design, it can be triggered accurately within the working temperature range of 150/110to provide stable heating. Timely cut off the power supply when the device overheats to Installation: Precise fit, solid installation without shaking. Simple design, quick and easy installation process, users can replace it by themselves, saving time and cost Colour:As Shown Material:Metal Due to different batches, there may be differences in product appearance and printed text, which not affect use Package Contents: 1 * 20162904 Limit Switch 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.