Our well rings range from 457 mm (18”) to 1220 mm (48”) inside diameter and are manufactured in 300 mm (12”) incremental heights up to a maximum of 900 mm (36”). All sizes are manufactured with a 75 mm (3”) wall thickness, some with interlocking tongue and grooves. Common uses include risers for catch basins, drywells, and septic tanks. A variety of lids are manufactured for each specific size to accommodate the particular end use.