Plastic pipe with bell joint

A pipe made of plastic, the pipe comprising:

• a female end provided with a bell joint suitable to receive a male end of another pipe;
• an inner wall provided with a seat for a gasket;
• and
• a gasket provided in said seat, said gasket configured to abut an external wall of the male end of the another pipe in an assembled configuration,
• wherein when the pipe and the another pipe are connected to form a joint, said gasket achieves a hydraulic seal between the pipe and the another pipe,
• wherein said inner wall has at least one closing lip with an annular shape,
• wherein said at least one closing lip extends towards an inside of said bell joint and towards an external front edge of said bell joint, said at least one closing lip including an abutment edge configured to adhere to, and tighten to with a defined force, the external wall of the male end of the another pipe in the assembled configuration, and
• wherein said at least one closing lip is interposed between said seat and said external front edge and forms, with said inner wall, an annular cavity that opens in a direction of said external front edge and
• wherein the annular cavity extends radially inwardly into said inner wall of the pipe such that when the male end of the another pipe is connected to form a joint, the force exerted by said closing lip on the external wall of the another pipe increases when plant roots penetrate inside the annular cavity so as to prevent the plant roots from damaging said gasket.