Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number BBV50TW found under Valve Ball by Dixon Valve And Coupling Co. The National Stock Number assigned to this part is 4820015567995, 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 BBV50TW.