Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21V100-5 found under Valve Check by Grimes Aerospace Company. The National Stock Number assigned to this part is 4820004333827, 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 21V100-5.