Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number KCV234-4-5 found under Valve Check by Fckingston Co. The National Stock Number assigned to this part is 4820011593138, 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 KCV234-4-5.