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.
Product Features
- Watertight and airtight
- Allows septic tank to be easily vacuum or water tested
- Highest UV-Ray 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