Carson® Specification Grade Valve Boxes are recognized as the Irrigation markets' original brand of grade-level access boxes. Backed by 40+ years of engineering excellence , our Specification Grade products line offers vertical and lateral strength in a lightweight material for ease of handling. Easily endures passes by both do-it-yourself gardening tools and commercial landscaping equipment. Boxes are made of structural foam High Density Polyethylene with UV inhibitors to provide a lifetime of consistent performance in a variety of weather conditions. Specification Grade boxes are easily modified in the field with a simple hole saw or jig saw. Boxes have mouseholes & knockouts to accommodate many pipe configurations. The reinforced bottom edge helps the box retain it shape after compaction. Reinforced Lid Seat helps ensure cover stability. Boxes have a lock option for added security. Made in the USA.