Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 025-18173C009 found under Heater Duct Type Stationary by Borgwarner Corp. The National Stock Number assigned to this part is 4520010321368, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 025-18173C009.