The 300-24® 4x standard cast iron 4″ tall riser ring is a durable and reliable solution for 300-24® series manholes, available as a stock item for quick delivery. Manufactured in the USA from uncoated ASTM A48 Gray Iron CL35B or better and meeting AASHTO M306 standards, this riser ring is H-20 traffic rated when paired with an H-20 traffic rated ring, cover, or grate properly installed in reinforced concrete. Standard-size steel riser rings are readily available, with additional sizes and styles offered for special orders, ensuring versatility for various applications. Contact Bass & Hays or call us today Toll Free 1-800-258-2278 -or- 972-263-1360 DFW Metro to check stock, request drawings or submittals, BABA, AIS or LEED certifications, or place orders.
