Abstract: The distribution pipe which is horizontally mounted includes longitudinal reinforcement ribs formed of an increased wall thickness and extending substantially the length of the pipe preferably along the interior surface thereof. One such rib extends along the top of the pipe and preferably two ribs extend in parallel and spaced relationship along the bottom of the pipe. The pipe is formed of a polyester resin having fiberglass reinforcement extending longitudinally throughout the wall and ribs. External stiffener rings are positioned on the pipe at spaced intervals defined by support locations and the pipe is suspended from concrete beams by cable extending about the pipe and beams. The cable is connected above the beams and forms loops below the beam, which loops extend about the external ring stiffeners.