Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 421225 found under Filter Fluid by Western Filter A Division Of. The National Stock Number assigned to this part is 1650001369655, and the Federal Supply Class is 1650 Aircraft Hydraulic Vacuum And De-Icing System Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 421225.