Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number AIGI66-04 found under Valve Assembly by B E C Systems Inc. The National Stock Number assigned to this part is 4820016219966, 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 AIGI66-04.