Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number P L 5393 REF NO. 34 found under Back Up Ring Preformed Packing by Bloom Inc. The National Stock Number assigned to this part is 5330015607486, and the Federal Supply Class is 5330 Packing And Gasket Materials. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like P L 5393 REF NO. 34.