Valve boxes, New generation of valve boxes made of high-impact strength polypropylene. Cepex Pro Series Valve Boxes provide ideal protection and easy access to in-ground irrigation valves, control modules, flowmeters and other subsurface equipment. Applications: landscape & agricultural irrigation, golf courses, water distribution networks, electric & cable networks, etc. High-impact polypropylene construction for long life and strong performance. Black body and green cover. Polypropylene is U.V. stabilized for greater strength and life through a wide range of temperatures.