Protect underground irrigation and sprinkler system components and keep them out of sight with the 6 in. Round Standard Series Valve Box. The sturdy 9 in. tall black access box is designed to work seamlessly with the 6 in. Round Standard Series overlapping cover, which is available separately. Built for durability with structural reinforcing ribs, the rugged enclosure features a pipe hole for water and irrigation pipe connections. Irrigation valve box is made of high-density polyethylene treated with UV inhibitors to resist wear and tear.