Abstract: A pipe made of plastics includes a female end with a bell joint suitable to receive a male end of another pipe and an inner wall with a seat for a gasket suitable to abut an external wall of the male end. When the pipe and other pipe are connected, a joint is formed having a hydraulic seal. The inner wall of the bell joint has at least one closing lip with an annular shape, which extends towards the inside of the bell joint, towards an external front edge of the bell joint, and includes an abutment edge, which adheres to, and tightens with a predefined force, the external wall of the male end. The closing lip is interposed between the external front edge and the seat and forms, with the inner wall, an annular cavity that opens in the direction of the external front edge.

Abstract: In an apparatus for overturning sheets and/or panels, a bearing structure carries a loading plane, and roto-translation means vertically translate the loading plane and rotate the same with respect to an axis. A grab device carried by the loading plane serves to transfer a sheet and/or panel from a supply station, when stopped upstream of the apparatus, on an operating surface. A command and control unit in alternatively activating and de-activating the roto-translation means, the stabilization and transfer and the grab device, defines for the loading plane a collection position, an overturning position and an unloading position of a sheet and/or panel to be overturned by the supply station placed upstream of the apparatus, over an unloading station downstream of the apparatus.