Carson® TrussT valve boxes are value-engineered to achieve top-down strength for lasting access to irrigation systems. Sidewalls feature "truss" reinforcements to withstand passing pressure from push-mowers, domestic riding mowers, and other do-it-yourself gardening equipment. Carson® high-density polyethylene (HDPE) products deliver reliable, chemical and water resistant performance and install with ease. The Carson® product line offers a wide variety of sizes and is preferred and specified by industry professionals nationwide.