Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CVC 4121 found under Valve Check by Triumph Aerostructures Llc. The National Stock Number assigned to this part is 4820010427626, 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 CVC 4121.