Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number F191D 1IN ITEM 16 found under Disk Valve by Conbraco Industries Inc. The National Stock Number assigned to this part is 4820012995813, 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 F191D 1IN ITEM 16.