Mechanical locking with locking ring fitted with a spring. During pipes joining, look after position the locking rings in the vertical level and not on the side. Males and Females aluminum couplers, welded at each extremity of the aluminum pipe. The water tightness is guaranteed by a double lip hydraulic seam as soon as pressure is on. The direction of water flow in the joining is Female-Male. It exist for this type of couplers a comple range of pressed hot galvanized steel accessories. (Tee in line, 45° and 90° Elbows, Cross, End plug, Valve) Tube conformable at standards NF A50801 etA50802. Pipes and accessories tested et CEMAGREF.