Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number D-407252 ITEM 13 found under O Ring by Harding Watercraft Inc. The National Stock Number assigned to this part is 5331013499403, 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-407252 ITEM 13.