Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 328-12 found under Diaphragm Valve Flat by A L D Inc. The National Stock Number assigned to this part is 4820009467906, 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 328-12.