A novel mooring line device is described and illustrated. The mooring line device is designed to engage a mooring line, the mooring line having a free end for attachment to a watercraft and a looped end for attachment to the mooring line device. The inventive mooring line device comprises two tubes, secured adjacent to one another, through which the mooring line is threaded. Once the mooring line is wrapped about a piling, the looped end of the mooring line may be engaged within a locking component of the mooring line device, and the mooring line subsequently tightened about the piling and secured thereto via the inventive mooring line device.