Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 998990-23.47X2.955ES found under O Ring by Eriks Bv. The National Stock Number assigned to this part is 5331000200064, 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 998990-23.47X2.955ES.