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. Dimension(s): 5-7/8 L x 5-7/8 W x 2 H. Inner diameter: 3-7/8. Use with 3 or 4 inch Sewer & Drain Pipe, 3 or 4 inch Corrugated Pipe, and 3 or 4 inch Triple Wall Pipe.