20″x 2″ risers are a great solution for systems needing only a few inches to come to grade.
- Allows tank, riser, and tank lid to be poured together
- Accepts additional 20” Risers to bring to grade for servicing
- Patented ring to guarantee watertight and airtight seal between concrete tank and riser
- Fits anywhere in the Riser stack
- Can be used as a 2″ Riser