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Polylok's 24"x12" risers can be stacked on top of each other. There are screw holes on the inside of the riser to attach it to a Polylok adapter ring, another Polylok riser, and Polylok distribution boxes or catch basins.
Polylok part number: 3008-R12R-NG (24" x 12" Riser w/ round walls) (Replaces retired part number: 3008-R12R)