The NDS STANDARD SERIES 21"x15" rectangular valve boxe's overlapping covers prevent dirt and grass from settling between body and cover. The rectangular valve boxes include a brass insert, so bolts may be easily added for lock down purposes. UV inhibitors are added to prevent discoloration and deterioration; 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.