Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number PL 323388-A ITEM 1 found under Valve Safety Relief by Zeks Air Drier Corp. The National Stock Number assigned to this part is 4820014076048, 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 323388-A ITEM 1.