The NDS STANDARD SERIES 12"x17" rectangular valve boxe's overlapping covers stop dirt and grass from collecting in the cover and the body of the valve box.  Also included in the rectangular valve box are brass inserts so that the valve box may be bolted down securely. UV inhibitors are added to prevent staining and corrosion; such as cracking or blistering.

NDS valve boxes and covers are injection molded of structural foam polyolefin material with a melt index between 10-12. Coloring and UV stabilizers are added, along with processing lubricants when needed.