Polylok 20″x3″ Riser/Riser Pan (PN: 3009-LPRP)

Amazon.com Price: $65.00 (as of 02/01/2024 23:22 PST- Details)

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