Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number EMTSD4UW found under Valve Sample Selec by Valco Instruments Company Inc. The National Stock Number assigned to this part is 4820015464106, 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 EMTSD4UW.