Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 3549 found under Plug Protective Dust And Moisture Seal by Rubbercraft Corporation Of. The National Stock Number assigned to this part is 5340013375856, and the Federal Supply Class is 5340 Hardware Commercial. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 3549.