Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL 423383-A ITEM 1 found under Valve Diaphragm Stop by Zeks Air Drier Corp. The National Stock Number assigned to this part is 4820014072985, 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 PL 423383-A ITEM 1.