Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number XA4089 found under Boot Dust And Moisture Seal by Dowty Industrial Corp. The National Stock Number assigned to this part is 5340002963235, 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 XA4089.