400-24D® Stackable Ring

The standard 400-24D® 24″ stackable manhole ring is designed for compatibility with the 400-24® series manhole covers or grates, as well as the 380-24® ML, offering a durable and versatile solution. This stock item includes 3″ cast iron riser rings, with custom steel risers available for special orders. Engineered for strength, it is H-20 traffic rated when properly installed in reinforced concrete and paired with an H-20 traffic-rated manhole cover or grate. Made from coated cast gray iron that meets ASTM A48 CL35B or better and AASHTO M306-10 (M105) standards, this product is proudly made in the USA, ensuring quality and reliability for heavy-duty applications.

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