Abstract: An enclosed conduit for use with cables, wires, lines and the like is preferably constructed using two separate extrusions which is formed of a self supporting resilient material. The first of these is a U-shaped base having side edges, the second is a cover adapted to overly the base between the side edges of the base, this cover having side edges. Coacting structures on the side edges of both the base and the cover permit the base and the cover to be snapped together or apart. An auxiliary retainer on the cover adjacent to the side edges of the cover are used to inhibit the inward deflection of the sides of the base when the cover is in place.