Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PROTO BUREAU 413331 found under Filter Fluid by Graver Technologies Llc. The National Stock Number assigned to this part is 2940013131549, and the Federal Supply Class is 2940 Engine Air And Oil Filters Strainers And Cleaners Nonaircraft. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like PROTO BUREAU 413331.