Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 103939 found under Seal Plain Encased by Ap Hydraulics Ltd. The National Stock Number assigned to this part is 5330002855870, 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 103939.