Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 16 004 002 found under Valve Safety Relief by Norgren C A Co. The National Stock Number assigned to this part is 4820006033683, 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 16 004 002.