Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D-171-300-4 PIE found under O Ring by Alstom Power Inc. The National Stock Number assigned to this part is 5331001675166, 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 D-171-300-4 PIE.