Protect underground irrigation and sprinkler system components and keep them out of sight with the sturdy 6 in. Round Standard Series Valve Box. This 8-5/8 in. tall black access box is designed to work with the 6 in. Round Standard Series snap-in 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 polypropylene treated with UV inhibitors to prevent fading and cracking due to sun exposure.