A pipe run is secured from theft by an antitheft apparatus providing a pair of straight tubes, coaxially engaged with an inner one of the tubes slidingly engaged within an outer one of the tubes. Each of the tubes provides a closure plate at one end with one or more apertures in it. A cover on an upper end of the inner tube is able to engage the pipe run to prevent it from being disassembled or pulled from its installation. To service the pipe run, the cover may be opened and the inner pipe lowered into the outer pipe. The tubes are secured to a mooring. Two of the apparatuses may be secured in spaced apart locations on the pipe run to secure components of the pipe run that are between the apparatuses.