Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number B57019REVAITEM2 found under Disk Valve by O C Keckley Company. The National Stock Number assigned to this part is 4820006087110, 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 B57019REVAITEM2.