Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5500-A1U-BF23A found under Nrp Oxygen Bottle by Pacific Scientific Company. The National Stock Number assigned to this part is 1680016109186, and the Federal Supply Class is 1680 Miscellaneous Aircraft Accessories And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 5500-A1U-BF23A.