Nds 6 in. Purple Round 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 made of high-density polyethylene (Hdpe) treated with Uv inhibitors. It features both snap-in and twist-lock design and knockout finger holes. Slip-resistant cover has a crosshatch pattern and embossed designation marking. The markings on the purple valve box lid indicate "Reclaimed Water."