Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number A57220 found under Diaphragm Valve Flat by O C Keckley Company. The National Stock Number assigned to this part is 4820002315915, 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 A57220.