Upgrade your septic system effortlessly with the Adapter Ring from Sedco Pier Inc., designed to work in conjunction with 24" corrugated riser pipe with the option of two inovative designs. The Square design accommodates up to a 30" septic opening, and the round cover fits 18-24" openings without needing to cut the adpater ring. Simplify your installation process and maintain the integrity of your tank with this versatile solution.