Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number C5V10-311-A1 found under Valve Check by Parker Hannifin Ltd. The National Stock Number assigned to this part is 4820013438380, 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 C5V10-311-A1.