Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 001 0001 76 002 0055 90 found under Ball And Seat Assembly by Portland Valve Llc. The National Stock Number assigned to this part is 4820011726018, 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 001 0001 76 002 0055 90.