This brand-new water temperature switch sensor with part numbers 16415-83040 and 1641583040 fits diesel engines perfectly. It accurately monitors coolant temperature and activates timely signal output to avoid engine overheating risks. Made of premium heat-resistant materials with fully sealed structure, it delivers stable performance and long service life in harsh working conditions. Manufactured to OEM standards, it features accurate size and great compatibility for daily diesel engine maintenance and aftermarket replacement.