Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FBI3250-1-20 found under Cooler Fluid Industrial by Yates American Machine Co Inc. The National Stock Number assigned to this part is 4420005139884, 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 FBI3250-1-20.