Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B842X9B found under Keel Cooler by R W Fernstrum And Company. The National Stock Number assigned to this part is 2040000084792, and the Federal Supply Class is 2040 Marine Hardware And Hull Items. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B842X9B.