Flexible corrugated polyamide conduits (PA) equipped with a longitudinal opening to allow installation of the conduit on systems already wired and obtain a mechanical protection. The product is composed of two longitudinally cut conduit having slightly different diameters in order to facilitate the closure without deformation of the corrugated. The system can also be used in dynamic applications without risk of damaging the cables. Excellent resistance to most chemical substances such as oils (max. Temp. +80°C), petrol, acids and solvents, halogen, silicone and cadmium-free. The product offers good resistance against UV rays.