Shield underground irrigation and sprinkler system parts from damage with the 10 in. Round Standard Series Valve Box. The black access box stands 10 in. high with structural support ribs for durability. This valve box features the patented Universal Locking Mechanism (ULM) that enables the valve box cover to be secured without the use of a nut and works with a variety of bolts and screws (5/16 to 3/8 in. diameter, minimum 1-1/2 in. length); cover can also be bolted down using the built-in speed nut shelf with nut and bolt if desired (cover, nut, and bolt not included). The rugged enclosure features a pipe hole to enable water and irrigation pipe connections. Designed to work with the 10 in. Round Standard Series Valve Box Cover. The irrigation valve box is made of polypropylene (PP) treated with UV inhibitors.