Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number V999PZB1000 PIECE 16 found under Case Lower Diaphrag by Hammel Dahl Inc. The National Stock Number assigned to this part is 4820011877109, 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 V999PZB1000 PIECE 16.