Abstract: Grating module for peripheral gutter for discharging overflow water from a swimming pool, which comprises a bendable, central longitudinal rib acting as a link for at least one transverse central rib arranged as a ridge on either side of this central rib, the said transverse rib being provided on its upper part with perpendicular slats projecting outwards and constituting the plantar span of the grating.

Abstract: In known manner, a pipe system comprises a group of tubes and couplings connecting a suction station to one or more suction openings, the tubes and couplings being equipped with low voltage electric conductors for transmitting an electric stop or start signal from the station. According to the invention, the conductors equipping the tubes are in the form of strips integral with the tubes. Such strips can also equip the couplings.

Abstract: The present invention relates to a method and apparatus for obtaining a metal-plastics composite tube. A layer of grafted polyethylene which comes directly into contact with the metal and a layer of cross-linkable polyethylene are extruded simultaneously at least inside this tube, with the aid of an extrusion nozzle having an annular conduit with two distinct coaxial inlets and a single outlet. The invention results in a composite tube having the malleability of lead, the rigidity of copper and a total inertia with respect to the aggressive agents flowing therein.