Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 12B-312-3143 found under Disk Valve by Goddard Valve Corp. The National Stock Number assigned to this part is 4820013394501, 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 12B-312-3143.