Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 9138-G505 REV A ITEM NO 3 found under Switchflow by Howell Laboratories Inc. The National Stock Number assigned to this part is 5930016922395, and the Federal Supply Class is 5930 Switches. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 9138-G505 REV A ITEM NO 3.