This Tuf-Tite adapter ring is designed for use with septic tanks and Tuf-Tite 16" diameter risers. It is made from durable, high-quality materials to ensure long-lasting performance and reliability. This adapter ring is easy to install and is designed to provide a secure, leak-free connection between your septic tank and riser. It also allows for easy access to your tank for maintenance and inspection purposes. With its strong and sturdy construction, this adapter ring is a great choice for any septic system.