Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 99977731-00 found under O Ring by Terex Kaelble Gmbh And Co Kg. The National Stock Number assigned to this part is 5331121430166, 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 99977731-00.