Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number OR4-7 found under Valve Saddle by A A A Products Co. The National Stock Number assigned to this part is 4820013557890, 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 OR4-7.