Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D449505 PIECE 5 2 1 2IN found under Stem Fluid Valve by Rockwell International Corp. The National Stock Number assigned to this part is 4820011513136, 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 D449505 PIECE 5 2 1 2IN.