Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 7516Y D449505 PIECE 2 1 2 IN found under Disk Valve by Rockwell International Corp. The National Stock Number assigned to this part is 4820011633596, 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 7516Y D449505 PIECE 2 1 2 IN.