Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 5L1 56 found under Retainer Sleeve Seal by Flodyne Controls Inc. The National Stock Number assigned to this part is 5330013587091, 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 5L1 56.