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Hold their shape and are stackable
Structural ribs inside prevent frost from adhering to the riser
Screw together assembly; Water and air tight
Lid, grate and basin sold separately
Made in the USA
6" Riser for 12" StormDrain Drain Box / Catch Basin Part No. FSD-3017-R This distribution box riser combines all the best features of concrete and plastic risers to create our patented riser system. Features: -Hold their shape -Stackable -Screw together assembly -Water and air tight Structural ribs inside prevent frost from adhering to the riser in the frost prone areas.