Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 309 0257 found under Sensor Engine Coolant Temperatur by Cummins Power Generation Inc. The National Stock Number assigned to this part is 2990013392895, and the Federal Supply Class is 2990 Miscellaneous Engine Accessories Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 309 0257.