NDS 111BC Standard Series Round Valve Box Overlapping Cover-ICV, 10-Inch, Black/Green Residential/commercial grade standard series valve boxes are offered in a wide range of sizes Overlapping covers prevent dirt and grass from settling between body and cover UV inhibitors are added to prevent discoloration and deterioration; such as cracking or blistering Residential/commercial grade standard series valve boxes are offered in a wide range of sizes UV inhibitors are added to prevent discoloration and deterioration; such as cracking or blistering