Polylok 20" x 6" Septic Tank Riser

The Polylok 20" x 6" Septic Tank Riser (Model 3009) is a reliable, stackable extension designed to bring septic tank, distribution box, or catch basin access conveniently to ground level. This 6" tall riser provides flexible height adjustments for moderate burial depths, making inspections, pumping, and maintenance faster and easier without constant digging.

Constructed from durable high-density polyethylene (HDPE), it combines the strength of concrete-style risers with the lightweight benefits of plastic—resistant to shattering, frost adhesion, and long-term weathering.

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

$48.00MSRP: $59.00

Item #:3009

Manufacturer:Polylok

Key Features and Benefits

Stackable Flexibility — Interlocks securely with other Polylok 20" risers (6", 12", 2", etc.) or adapter rings to achieve custom heights—no cutting required.
Secure Locking System — Snaps/locks into position and fastens with included stainless steel screws for a stable, dependable connection.
Watertight and Airtight Performance — Supports vacuum or water testing of the septic system; use butyl sealant tape (ASTM-C990 compliant) between sections for a reliable seal (note: Polylok risers no longer include factory-installed gaskets—sealant tape is strongly recommended).
Heavy-Duty Reinforcements — Features internal structural ribs for added rigidity and strength; handles pedestrian traffic and light loads like lawn mowers or small garden tractors when properly installed and backfilled.
Superior UV Protection — Highest UV-ray resistance available to prevent fading, cracking, or brittleness from prolonged sun exposure.
Frost-Resistant Design — Structural ribs help prevent frost from adhering in cold climates.
Lightweight & Easy to Handle — Much simpler to transport and install than heavy concrete alternatives, reducing labor and installation time.
Versatile Compatibility — Works on Polylok 20" risers, adapter rings, or directly on Polylok 6-Hole (#3017-6H) and 8-Hole (#3017-8H) distribution boxes.
Made in the USA — Patented Polylok design from a trusted leader in onsite wastewater and septic products.

Specifications

Diameter: 20 inches
Height: 6 inches
Material: High-density polyethylene (HDPE)
Color: Green (typical)
Compatibility: Fits Polylok 20" series risers and adapter rings (#3009-AR square tank adapter or #3009-RTR20 round tank adapter). Compatible with Polylok 6-Hole and 8-Hole Distribution Boxes (#3017-6H, #3017-8H). Not interchangeable with other brands without proper adapters.
Included: Riser section + stainless steel installation screws

Important Note: Measure the distance from your tank lid (or distribution box) to finished grade to determine required stack height. Combine with 12" tall (#3009-R12), 2" grade (#3009-GR2), or other sections as needed.