This NDS Valve Box has a 10" x 15" x 10" body that is tapered and has a minimum wall thickness of 0.130". The body has a double wall at the top cover seat area with a minimum thickness of 0.200". The cover seat area has 12 structural support ribs on the underside of the seat, each with a minimum thickness of 0.130". The bottom of the body has a 0.750" flange. The D1000 cover has an average thickness of 0.187". NDS D1000 valve boxes and covers are injection molded of structural foam recycled polyolefin material with a melt index between 10-12. Coloring and UV stabilizers are added, along with processing lubricants when needed.