Square Grate – 5 inch Green. This grate helps to collect and remove excess water from driveways patios and any other outdoor areas designed for maximum durability to handle light foot traffic. NDS grates are a proven alternative to traditional concrete drains with UV inhibitors are used to prevent fading and cracking from the sun chemical-resistant rustproof and maintenance-free lightweight and easy to install. Can be used with 3 or 4 inch sewer and drain pipe and fittings corrugated pipe and triple wall pipe.