Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number VD729250B found under Valve Check by Premier Copper Division Of W And O. The National Stock Number assigned to this part is 4820015679972, 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 VD729250B.