Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1S-1120-5-16 found under O Ring by Flowserve Corporation. The National Stock Number assigned to this part is 5331013954691, 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 1S-1120-5-16.