Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 1ST X 2ND STG SUC VALVE found under O Ring by Dresser Rand Co. The National Stock Number assigned to this part is 5331010694851, 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 1ST X 2ND STG SUC VALVE.