Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number NO PRIMARY REF 99 562 3718 found under Valve Ball by This Ncage Is Used To Inform That. The National Stock Number assigned to this part is 4820995623718, 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 NO PRIMARY REF 99 562 3718.