Builders Adjustable Periscope 18 in. to 29 in. is a versatile and practical solution designed to reduce the space between your dryer and the wall from 4-1/2 inches to 2-1/2 inches, allowing for closer and better use of space. Its beveled ends are thoughtfully crafted to eliminate interference with floors and side walls, ensuring a smooth and secure fit. The sections of the periscope can be separated and reversed, making connections easier and more adaptable to your venting needs. This all-metal, rigid construction s durability and long-lasting performance. Additionally, it can be used for side access venting, providing flexibility in installation options. This product combines functionality and quality to optimize your dryer venting setup. Model Number: 10133