Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 507385-1 found under Diaphragm Valve Fla by A O Smith Corporation. The National Stock Number assigned to this part is 4820007733685, 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 507385-1.