Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number M25988-920L1077-75 found under O Ring by Parker Hannifin Corporation. The National Stock Number assigned to this part is 5331014980727, 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 M25988-920L1077-75.