Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number X1220T66 found under Retainer Oil Lubric by Dresser Rand Co. The National Stock Number assigned to this part is 2805009557626, and the Federal Supply Class is 2805 Gasoline Reciprocating Engines Except Aircraft And Components. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like X1220T66.