Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 75D291031-2017 found under Support Leakage Tester by Kreis Tool And Manufacturing Co Inc. The National Stock Number assigned to this part is 4920013174539, 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 75D291031-2017.