NDS 6-1/8 in. green round economy valve box overlapping ICV cover is designed to help prevent dirt and grass from settling between the cover and valve box. This cover is made from foam polyolefin. NDS valve, meter and access boxes are offered in a wide range of sizes from the 6-inch round valve box to the 17 in. x 30 in. rectangular box. They are available with black, green, purple, gray and sand covers with designations including irrigation control valve, water, sewer, electric, reclaimed water, cable TV, telephone and others.