Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B-4955 found under Valve Ball by Bijur Lubricating Corp. The National Stock Number assigned to this part is 4820003599172, and the Federal Supply Class is 4820 Valves Nonpowered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like B-4955.