• Watertight and airtight Allows septic tank to be easily vacuum or water tested Highest UV protection on the market today Easy-to-bring septic access to grade Made of high density polyethylene which won't shatter like some polypropylene risers Tear off riser ring if frost is a problem

Polylok's 24 x 12 in 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. There are two Polylok 24 x 12 in riser models, one with a round wall design and one with wall flats.