Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number FB80 found under Valve Vacuum Regula by Cissell Manufacturing Company. The National Stock Number assigned to this part is 4820012267081, 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 FB80.