Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number R166D8 74 found under Nipple Pipe by Fmc Technologies Inc. The National Stock Number assigned to this part is 4730001897587, and the Federal Supply Class is 4730 Hose Pipe Tube Lubrication And Railing Fittings. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like R166D8 74.