Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C 8312 NCB725 SR80 found under Valve Butterfly by Pratt Henry Co. The National Stock Number assigned to this part is 4820016137779, 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 C 8312 NCB725 SR80.