Abstract: The invention can be used in pipelines, any devices, man holes and arrangements, at any pressures and working conditions for closable large-diameter pipes. The object of the present invention is to improve serviceability of a gate. The inventive gate comprises a lid consisting of a flange and a bottom which is caved-in inwards the pipe, a sleeve provided with a supporting ring which is welded to the bottom, arresting elements in the form of sectors inserted into a circular recess of the pipe when they are radially displaced on the flange along clamping bolts and on the supporting ring by the action of the inclined surface of a drive nut, are arranged on the end face of the flange and on the supporting ring. The nut is embodied in the form of a truncated pyramid provided with T-slots on lateral surfaces thereof.