The NDS 18 in. Catch Basin, 2 Opening features UV-resistant 1-piece injection-molded structural polypropylene construction for strength. This item is used for areas where water buildup occurs. Catch Basins catch and divert water to water-safe areas away from structures, erosion-prone landscapes, and poor drainage areas. This catch basin is made with polyethylene and built tough to handle the demands of residential, commercial, and industrial environments. Connects to 3 in. and 8 in. drain pipes with designated outlet adapters (sold separately) for a soil-tight fit. Flow capacity will vary based on pipe size. 18" Catch Basin, 2 Opening is suitable for light vehicular traffic when properly installed, suitable for both landscape and hardscape applications, and able to withstand normal abuse in landscaping applications. 18" Catch Basin, 2 Opening are fade-resistant, rust-resistant, lightweight, and easy to install!