which a central section of a pipeline is coupled to outer sections supported by and keyed to wheels and sprockets mounted rotatably on the central section and coupled to carriage wheels which are selectively pinned to the central section fig1 is a perspective view of an irrigation line move including an improved drive forming one embodiment of the invention fig2 is an enlarged vertical section taken along line 2 2 of fig1 fig3 is an enlarged vertical section taken along line 3 3 of fig2 fig4 is an enlarged vertical section taken along line 4 4 of fig3 and fig5 is an enlarged vertical section taken along line 5 5 of fig3 referring now in detail to the drawings there is shown therein an irrigation line move 10 including an improved drive 12 forming one specific embodiment of the invention the move inlcudes a pipeline 14 which acts as a torque tube as well as a water supply to sprinklers 16 mounted on trail lines 18 and rotary couplers 20 supplied with water from the pipeline wheels 22 are keyed to the pipeline and are rotated thereby when the pipeline is rotated by a power unit 24 on a power carriage 26 the power unit 24 may comprise a reversible drive including a gasoline engine electric motor or water motor in a housing 28 on a frame or chassis 30 of the carriage the power unit when energized continuously rotates a bull gear 32 welded and thereby sealed to a short pipe section 34 of the pipeline 14 and forming a coupling flange to which a long flanged pipe section 36 of the pipeline 14 is secured by capscrews 38 a gasket 40 being positioned therebetween a flange 42 welded to the pipe section 34.