Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 505081900 found under Cap Protective Dust And Moisture by United Refrigeration Inc. The National Stock Number assigned to this part is 5340016088647, 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 505081900.