Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number E 223R PC16 found under Bushing Valve Stem by Clark Reliance Corporation. The National Stock Number assigned to this part is 4820006756039, 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 E 223R PC16.