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264 Gallon Underground Septic Tank Kit, Plastic Septic Tank System for 3–5 People, Mini Septic System for Cabin, Tiny Home & Off-Grid Living, Includes 6 Risers & Covers, 69.9×40.1×36.6 in

  • Based on 2 reviews
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Availability: In Stock.
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Arrives Saturday, Sep 5
Order within 22 hours and 1 minute
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Features

  • SMALL SEPTIC TANK SYSTEM FOR CABINS, TINY HOMES & OFF-GRID LIVING. Built for small households and remote setups, this Tankify 264 gallon septic tank kit supports 35 users. Made from heavy-duty polypropylene (PP), this rectangular plastic septic tank resists corrosion, soil pressure, and temperature changes, delivering a long-lasting compact wastewater solution. Designed for tiny house owners, remote cabins, ADU projects, workshops, and off-grid properties where larger traditional septic systems may be impractical or unnecessary.
  • 6 SEPTIC TANK RISERS & COVERS BUILT FOR REAL-WORLD INSTALLATIONS. Includes 6 risers and 6 covers (most kits include only 3). While 3 are used for standard installation, the additional set provides built-in backup for unexpected situations, adjustments, or future needs. Designed for real-world conditions where plans change, giving you flexibility, long-term reliability, and peace of mind. Helps provide additional flexibility for real-world installations, future adjustments, and unexpected project changes.
  • UNDERGROUND SEPTIC TANK FOR RELIABLE USE. Designed for underground septic system installations, this plastic septic tank is built to handle soil contact, moisture, and environmental exposure while maintaining consistent, low-maintenance performance. Ideal for homeowners looking for easier long-term septic system maintenance with simplified access for inspections and servicing.
  • EASY MAINTENANCE RISER SYSTEM NO EXCAVATION NEEDED. Above-ground risers provide quick access for inspection and servicing without digging, reducing labor costs and simplifying long-term maintenance. Especially useful for space-limited properties where reducing excavation work can help simplify maintenance over time.
  • COMPLETE SEPTIC TANK INSTALLATION KIT. Includes essential tools and safety gear: gloves, face mask, hammer, wrenches, and tape measure. Ideal for DIY septic system setups or professional installation. Suitable for cabin builders, rural property owners, off-grid living setups, and first-time septic system projects.
  • IMPORTANT INSTALLATION REQUIREMENTS. Check local regulations before purchase. Professional installation required. Exhaust pipes and caps sold separately. Product must remain unused and uninstalled for returns.

Product Dimensions ‏ : ‎ 69.88 x 40.16 x 36.61 inches; 117.07 pounds


Item model number ‏ : ‎ 264 GAL TANK


Date First Available ‏ : ‎ April 27, 2026


Manufacturer ‏ : ‎ TANKIFY


Best Sellers Rank: #263,481 in Health & Household (See Top 100 in Health & Household) #131 in Septic Tank Treatments


#131 in Septic Tank Treatments:


Customer Reviews: 5.0 5.0 out of 5 stars (2)


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Saturday, Sep 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Top Amazon Reviews


  • No surprises, just a solid product.
After comparing several options, I decided on this one because it included everything I needed. The quality looks excellent, and the dimensions were accurate.
Reviewed in the United States on August 6, 2026 by Michael Swarts

  • More Complete Than Other Options
This tank honestly exceeded my expectations. The material feels solid, and the installation was easier than I thought. It comes very complete, including tools and gloves. Compared to other options that only offer 3 risers and 3 lids, this one includes 6 of each, which is a huge advantage since those parts are not easy to find separately. This saves both time and money. ... show more
Reviewed in the United States on June 14, 2026 by Alexander Fox

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