Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number WK-871-125 PC. 25 SIZE -113 found under O Ring by Walz And Krenzer Inc. The National Stock Number assigned to this part is 5331016207436, and the Federal Supply Class is . Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like WK-871-125 PC. 25 SIZE -113.