Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number MPB 34 S2 POC1B4 REV O ITEM 2 found under Ball Valve Ported by Pbminc. The National Stock Number assigned to this part is 4820014257684, 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 MPB 34 S2 POC1B4 REV O ITEM 2.