Build Your Own 24'' Septic Tank Riser Kit
1 Choose A 24'' Adapter Ring
The first component that you need in order to build a septic riser kit is the adapter ring. The adapter ring mounts directly to the septic tank, allowing the risers to stack, lock, and mount to it.
Only ONE of the two options below is required!
- Best Seller
Polylok Square Tank Adapter Ring The Polylok Square Tank Adapter Ring accepts either 20'' or 24'' risers. The large squared shape of this adapter allows it to cover up to 25'' x 25'' square openings or up to 27'' in diameter round openings. It is recommended to mount this adapter ring to the tank using our Adapter Ring Installation Kit (#ANCHORKIT). Once mounted and sealed to the tank, any combination of Polylok risers and lids will attached directly to this adapter. READ MOREItem #:3009-AR
Product VideoOur Price: $85.00MSRP: $99.00 
Polylok 24" Round Tank Adapter Ring This Polylok Round Tank Adapter Ring is for 24'' round or smaller openings. This ring allows you to mount the Polylok risers to a concrete or plastic septic tank. This may also be used to convert other brands of risers to the Polylok system. Once the adapter ring is mounted and seals, any combination of Polylok 24'' diameter risers or lids will attach directly to this ring. READ MOREItem #:3009-RTR24
Product VideoOur Price: $48.50MSRP: $59.00
2 Choose A 24'' Septic Tank Riser
Risers are used to bring the access of your septic tank to grade. Choose any combination of the options below to achieve the required height that you would like for your septic tank riser kit. The Polylok risers are stackable.
Polylok 24" x 6" Septic Tank RiserThe Polylok 24" x 6" Septic Tank Riser (Model 3008) is a durable, high-quality extension designed to bring your septic tank access easily to ground level, eliminating the need for digging during inspections, pumping, or maintenance.
Made from tough high-density polyethylene (HDPE), this riser combines the best features of traditional concrete and plastic systems. It's engineered for strength, longevity, and ease of use in residential and commercial septic applications.
POLYLOK RISERS NO LONGER COME WITH A FACTORY INSTALLED GASKET. We recommend using our butyl sealant tape to create a seal between risers.
READ MOREItem #:3008
Product VideoOur Price: $62.00MSRP: $75.00
Polylok 24" x 12" Septic Tank RiserThe Polylok 24" x 12" Septic Tank Riser (Model 3008-R12) is a versatile, heavy-duty extension riser built for bringing septic tank access to or near ground level with fewer sections. At 12" tall, it's the taller stacking option in the Polylok 24" series—ideal for moderate burial depths or combining with 6" and 2" risers in the Build-a-24 Riser Kit for custom, precise heights.
Constructed from rugged high-density polyethylene (HDPE), this riser offers exceptional durability, UV resistance, and ease of handling compared to concrete alternatives.
POLYLOK RISERS NO LONGER COME WITH A FACTORY INSTALLED GASKET. We recommend using our butyl sealant tape to create a seal between risers.
READ MOREItem #:3008-R12
Product VideoOur Price: $109.00MSRP: $125.00
Polylok 24'' x 2'' Septic Tank RiserThe Polylok 24" x 2" Septic Tank Grade Riser (Model 3008-GR2) is the perfect low-profile solution for fine-tuning your septic tank access to exact finished grade level. When you need just a couple of inches to bring the lid flush or slightly above ground—without excess height—this 2" tall riser delivers precision and reliability.
Crafted from durable high-density polyethylene (HDPE), this grade riser shares the same trusted Polylok quality as taller sections but in a slim 2" profile. It's ideal for final adjustments in the "Build-a-24" Riser Kit system, allowing you to stack it with 6", 12", or other compatible risers for custom heights.
The safety screen (#3008-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.
READ MOREItem #:3008-GR2
Product VideoOur Price: $59.00MSRP: $69.00
3 Choose A 24'' Riser Lid
The final component that you will need to complete your septic tank riser kit is a lid. The standard lid has handles for easy access, a factory installed gasket, and comes with stainless steel screws to lock in place. These lids can handle foot traffic or the weight of up to a riding lawn mower driving across them. The heavy duty lids are recommended for below grade installations or areas with high foot traffic.
Polylok 24" Septic Tank Riser LidThe Polylok 24" Septic Tank Riser Lid (Model PL-24RC / 3008-RC) is the essential finishing component for any Polylok 24" riser system. This standard lid provides secure, convenient, and watertight access to your septic tank while blending seamlessly with your landscape.
Made from high-quality high-density polyethylene (HDPE) with the highest UV protection available, this lid is built to last in outdoor conditions—resisting fading, cracking, and degradation from sun exposure over years of service.
READ MOREItem #:3008-RC
Product VideoOur Price: $60.00MSRP: $69.00
Polylok 24" Heavy Duty Septic Tank Riser LidThe Polylok 24'' Heavy Duty lid fits the Polylok 24'' diameter risers and adapter rings. This cover is perfect for high foot traffic installations! This lid is flat and includes a skid resistant surface. Every cover comes with a factory-installed gasket to ensure an airtight and watertight seal! This lid works in place of the 3008-RC standard cover or 3008-HD heavy duty cover.
READ MOREItem #:3008-WEST
Product VideoOur Price: $80.00MSRP: $95.00
4 Choose Optional 24'' Accessories
Below are optional but recommended accessories to include with your septic riser kit.
Polylok 24" Septic Tank Riser Safety ScreenThe Polylok 24" Septic Tank Riser Safety Screen (Model 3008-SS) is a critical safety accessory designed to provide an extra layer of protection for your septic system. This bright yellow, heavy-duty screen installs inside the top of your Polylok riser stack, acting as a secondary barrier to prevent accidental entry into the septic tank if the riser lid is damaged, removed, or accidentally left off—helping safeguard children, pets, and unsuspecting individuals.
Made from durable ABS plastic, this safety screen is engineered for reliability and visibility, ensuring peace of mind in residential settings where septic access points are present.
Note: This item will not fit the 24'' x 3'' Pan Riser (#3008-RP) or the 24'' x 2'' Grade Riser (3008-GR2).
READ MOREItem #:3008-SS
Product VideoOur Price: $34.50MSRP: $45.00- Best Seller
Adapter Installation Anchor Kit The adapter ring installation kit is used to mount and seal the Polylok tank adapter rings to a concrete tank. The kit includes concrete anchors, a masonry bit, and butyl sealant. READ MOREItem #:AnchorKit
Our Price: $25.00MSRP: $39.00 
Butyl Sealant RopeThe butyl sealant rope is used to seal the tank adapter ring to concrete, plastic, or fiberglass septic tanks. This can also be used as a sealant between riser sections that do not have an existing gasket.
24’’ Diameter Risers – Seal 3 Risers per 20ft Roll
20’’ Diameter Risers – Seal 4 Risers per 20ft Roll
12’’ Diameter Risers – Seal 6 Risers per 20ft Roll20ft Roll (1/2'' Wide, 1/4'' Thick)
READ MOREItem #:ASTM-C990
Our Price: $14.95MSRP: $19.95
WHAT ARE SEPTIC TANK RISERS?
Septic tank risers are vertical extensions, typically made of durable materials like PVC, polyethylene, or concrete, that are installed over the access ports of a septic tank. They bring the tank's access point up to or slightly above ground level, making it easier to inspect, maintain, and pump the septic system without the need for extensive digging.
Septic tank risers are a practical upgrade for any septic system, improving accessibility, safety, and maintenance efficiency. If you’re considering installing risers or need help choosing the right type, consult our sales team for guidance tailored to your system’s specifications.
PURPOSE AND BENEFITS
Septic tank risers serve to simplify access to the septic system, offering several advantages:
- Ease of Access:
- Eliminates the need to dig up soil to reach the septic tank’s access ports during routine maintenance or pumping.
- Saves time and labor costs for homeowners and septic professionals.
- Cost-Effective Maintenance:
- Reduces expenses associated with digging and landscaping restoration after each inspection or pump-out.
- Extends the lifespan of the septic system by facilitating regular maintenance.
- Safety:
- Secure lids prevent accidental falls or unauthorized entry, especially for households with children or pets.
- Reduces the risk of soil collapse during maintenance.
- Aesthetics:
- Risers can be installed flush with or slightly above ground level, blending into the landscape.
- Lids can often be covered with grass or decorative covers to maintain yard aesthetics.
THE POLYLOK SEPTIC TANK RISER ADVANTAGE
There are many different types and styles of septic riser kits and packages on the market today. Building a septic riser kit from Polylok products will guarantee you the best your money can buy. The reasons are many, but here are the most important:
INTERNAL STRUCTURAL RIBS
The Polylok septic tank risers have structural ribs internally around each riser section which give them great strength and allow them to hold their shape with the pressure of soil being pushed against them once the hole is backfilled. These internal structural ribs allow the outside of the riser to be smooth, this is important because of the freezing and thawing of the ground in many areas. When the ground freezes and thaws it expands and contracts and products with structural support on the outside of the riser can actually be lifted from the tank causing damage to the riser and the seal. The Polylok products will have no issues in frost areas because they are completely smooth on the outside!
LOW PROFILE RISER LIDS WITH HANDLES
The septic tank access lid on a riser system is one of the most important components, because it is what you see in your yard and also what you have to remove every time the system is pumped or maintained. The Polylok lids come with pre-installed handles that allow you to easily remove the lid any time you want to access the system. The lids are structurally supported on the bottom which also allows them to be relatively flat, instead of domed shaped like many other products on the market.
LARGE TANK ADAPTER RING
In order to put septic tank risers onto your septic tank, you need an adapter ring. Polylok has one of the largest adapter rings on the market allowing you to cover up to a 25’’ square opening or a 27’’ round opening. This ring accepts both 20’’ and 24’’ risers and gives you great flexibility no matter what size your opening may be.
SCREWS INCLUDED
At Septic Solutions we want to make your ordering and installation process as simple as possible. All of our Polylok Septic Tank Risers and Lids come complete with the screws necessary to install them.
