Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D2221 found under Strainer Element Sediment by Bethlehem Steel Corp. The National Stock Number assigned to this part is 4730008541239, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like D2221.