Waste line of flexible plastic (1) comprising: - a body (2) of hose having a flexible tubular outer wall comprises portions (7) alternating with portions of reinforcing ribs of at least one rib helical reinforcement (8), the web parts (7) have predetermined properties chosen to provide flexibility to the hose body (2) and at least one rib and reinforcement (8) having predetermined properties to provide crush resistance the body (1) of hose - a sleeve (3a) mounted on at least a first end (16a) of the body (2) hose and comprising an end fitting molded (5a) having a bore (14) to connect the hose (1) to another device, the end fitting (5a) adheres to the first end (16a) of the body (2) of hose characterized in that - the sleeve (3) further comprises a strain relief (4) on an inlet side (19) of the sleeve (3) in the body (2) hose enters the sleeve (3) , element stress relief (4) has a first segment (S1) with a thread internal thread (15) complementary to the reinforcing rib (8) for a next installation around the body (2) hose without adhere to the first end (16a) of the body (2) hose, thereby reducing the tension on the web parts (7) on the first end (16) during use of the hose (1).Manquera de plástico flexible (1), que comprende: - un cuerpo (2) de manguera que tiene una pared exterior tubular flexible que comprende unas partes de alma (7) que alternan con unas partes de nervaduras de refuerzo de por lo menos una nervadura de refuerzo helicoidal (8), las partes de alma (7) tienen unas propiedades predeterminadas elegidas para proporcionar flexibilidad al cuerpo de manguera (2) y la por lo menos una nervadura e refuerzo (8) tiene unas propiedades predeterminadas para proporcionar resistencia al aplastamiento al cuerpo (1) de manguera - un manguito (3a) montado en por lo menos una primera extremidad (16a) del cuerpo (2) de manguera y que comprende un accesorio extremo moldeado (5a) que tiene un calibre (14) para conectar la manguera (1) a otro dispositivo, el accesorio ex
