Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 638242 found under Disk Valve by Kwik File Storage Systems Llc. The National Stock Number assigned to this part is 4820001919060, 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 638242.