Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 63-E-121 PIECE found under Ball Valve Ported by Eastern Industrial Products Inc. The National Stock Number assigned to this part is 4820003400915, 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 63-E-121 PIECE.