The Oldcastle Enclosure Solutions Extension B1730 X 12" is designed for durability and functionality. This extension features a HS20-44 stencil, ensuring compliance with industry standards for load-bearing applications. Constructed from high-quality materials, it provides robust protection for underground utilities. The dimensions of 12 inches in height and 30 inches in length make it suitable for various installations. Ideal for use in municipal and commercial settings, this extension is compatible with a range of Oldcastle enclosures, enhancing their versatility and performance.