Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WK-871-126 PC NO 21 found under Switch Proximity by Walz And Krenzer Inc. The National Stock Number assigned to this part is 5930016211445, 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 WK-871-126 PC NO 21.