Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number S214-4 found under Spring Valve Safety by Teledyne Technologies Inc. The National Stock Number assigned to this part is 4820008964666, 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 S214-4.