Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 4-0-51-03-K found under Disk Valve by Universal Industrial Products Co. The National Stock Number assigned to this part is 4820012705074, 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 4-0-51-03-K.