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Polylok 20'' x 2'' Septic Tank Grade Riser

The Polylok 20" x 2" Septic Tank Grade Riser (Model 3009-GR2) is the ideal low-profile extension for achieving precise, flush-to-grade septic tank or distribution box access. At just 2" tall, this slim grade riser is perfect for final height adjustments in the Build-a-20 Riser Kit system—when you need only a few inches to bring your lid perfectly level with the ground without excess protrusion or sunken appearance.

Built from tough high-density polyethylene (HDPE), it delivers the same trusted Polylok durability, UV resistance, and ease of use as taller sections, while remaining lightweight and simple to install.

The safety screen (#3009-SS) will not attach directly to this item.

POLYLOK RISERS NO LONGER COME WITH A FACTORY INSTALLED GASKET. We recommend using our butyl sealant tape to create a seal between risers.

In Stock

$45.00MSRP: $59.00

Item #:3009-GR2

Manufacturer: Polylok

Product Documents

3009-GR2_Specifications

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Butyl Sealant Rope

Item #:ASTM-C990

Our Price: $14.95MSRP: $19.95

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Ship Date Wed, Mar 11

Delivery: 1-4 Business Days

Key Features and Benefits

Ultra-Slim 2" Height — Designed specifically as a "grade riser" for minimal extensions; perfect for fine-tuning to exact finished grade in lawns or landscapes.
Stackable Compatibility — Locks securely with other Polylok 20" risers (6", 12", etc.) or adapter rings; build custom heights effortlessly in the Polylok 20" series.
Secure Fastening — Snaps/locks into place and includes stainless steel screws for a stable, long-term connection (use alternating screw pattern for even pressure).
Watertight and Airtight Design — Supports vacuum or water testing of septic tanks/distribution boxes; POLYLOK RISERS NO LONGER INCLUDE FACTORY GASKETS—apply butyl sealant tape (ASTM-C990 compliant) between sections for reliable sealing against groundwater.
Heavy-Duty Strength — Reinforced with structural ribs for rigidity; capable of supporting pedestrian traffic and light loads like lawn mowers or small garden tractors when properly installed and backfilled.
Superior UV Protection — Highest UV resistance on the market to resist fading, cracking, or brittleness from extended sun exposure.
Frost-Resistant — Structural design helps prevent frost adhesion in colder climates.
Lightweight & Easy Install — Far easier to handle and transport than concrete risers, cutting down on labor and effort.
Made in the USA — Patented Polylok quality from a leader in septic and onsite wastewater solutions.

Specifications

Diameter: 20 inches
Height: 2 inches
Material: High-density polyethylene (HDPE)
Color: Green
Compatibility: Fits Polylok 20" risers, adapter rings (#3009-AR square tank adapter or #3009-RTR20 round tank adapter), and Polylok 6-Hole (#3017-6H) or 8-Hole (#3017-8H) distribution boxes. Not directly compatible with other brands without adapters.
Included: Riser section + stainless steel attachment screws

Important Compatibility Note: The Polylok 20" safety screen (#3009-SS) does not attach directly to this 2" grade riser—use on taller 6" or compatible sections instead.