Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number CTO1681-105FG found under Adapter Straight Fl by R Kern Engineering And Mfg. The National Stock Number assigned to this part is 4730013511583, 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 CTO1681-105FG.