Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21021616-101 found under Valve Regulator Ass by Bae Systems Information And Electronic Systems Integration I Dba Bae Systems Nor. The National Stock Number assigned to this part is 4820010879895, 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 21021616-101.