Looking for the largest stock tank available to suit your needs? This guide highlights five top options, focusing on capacity, durability, and practicality for outdoor use, livestock watering, and large wash areas. Each pick targets a different scenario—from heavy-duty commercial containers to versatile livestock troughs—so you can choose the best fit for your space and purpose. The buyer types covered include ranchers needing rugged containers, hobbyists seeking large DIY pools, and vehicle owners needing a compatible tank for custom setups.
| Product | ||
|---|---|---|
| Rubbermaid Commercial 50-Gallon Stock Tank | 50 gallons | Heavy-duty outdoor use, livestock water troughs |
| Stock Tank Secret | 9″ x 7″ (mini stock tank accessory) | Small-space setups, accessories for stock tanks |
| TRQ Gas Fuel Tank 20 gal (Jeep Cherokee) | 20 gallons | Vehicle-related fuel storage and utility use |
| Tuff Stuff Oval Tank | 40 gallons | Oval shape for compact spaces and versatile mounting |
| Behlen Country Farm Flex Round Stock Tank | 8 ft x 2 ft (approx. large capacity) | Large outdoor stock watering and farm use |
Rubbermaid Commercial 50-Gallon Stock Tank

The Rubbermaid 50-Gallon stock tank offers a large, heavy-duty container designed for outdoor use with livestock and general utility tasks. This model is a structural foam tank that is built to withstand frequent exposure to the elements and animal interaction. Best for buyers needing a robust, low-maintenance trough that can double as a large water source or outdoor tub for pets and livestock.
Best for: Ranchers or backyard owners seeking a dependable, high-capacity trough that remains sturdy in variable weather. Better for long-term outdoor installations due to its structural foam construction.
Caution: Size and weight mean installation may require a level surface and secure setup to prevent tipping in strong winds or uneven ground.
Stock Tank Secret

Stock Tank Secret is listed as a brown 9″ x 7″ option, useful as a fill-in accessory for existing stock tanks or as a decorative/functional add-on in small setups. It’s a compact solution when space is at a premium and you don’t need a full-size trough.
Best for: Small-space configurations or as an accessory piece to a larger tank. Choose this when you need a supplementary or modular part rather than a primary water container.
Caution: This product is not a full-size tank; it’s best used in conjunction with a separate stock tank or as a specific accessory rather than a standalone watering trough.
TRQ Gas Fuel Tank 20 gal (Jeep Cherokee)

The TRQ 20-gallon gas fuel tank is designed for vehicles such as the 1986-1996 Jeep Cherokee and 1986-1990 Wagoneer. It’s suitable for automotive fuel storage and related utility tasks rather than livestock watering. Best for: Vehicle owners needing a replacement or auxiliary fuel tank compatible with classic Jeep models. Better for automotive use than for farm water storage.
Caution: This product is a fuel tank, not a water trough; ensure proper installation, venting, and safety handling for fuel storage purposes.
Tuff Stuff Oval Tank 40-Gallon

The Tuff Stuff Oval Tank provides a 40-gallon capacity with an oval shape that can be advantageous in tight spaces or unique setups where a round trough won’t fit as easily. Best for: Owners needing a high-capacity tank with an elongated footprint for easier placement in narrow areas. Choose this if wall clearance or fence line alignment matters. Limitation: May not fit in some standard trough slots designed for circular tanks.
Behlen Country Farm Flex Round Stock Tank

The Behlen Country Farm Flex Round Stock Tank is a large round tank configured as a stock tank, described as Model# 52113088 with an 8 ft by 2 ft dimension. This offers substantial capacity for livestock watering and general outdoor use. Best for: Farmers or large property owners needing a sturdy round tank for extensive outdoor watering or washing tasks. Better for bulk water storage needs than tiny troughs. Caution: Large size requires solid ground and may be heavy to relocate.
Buying Guide
- Larger tanks provide more water or use options but require more space and stronger mounting surfaces. Measure installation area before choosing.
- Structural foam and heavy-duty plastics resist cracking and weathering; ensure the material suits outdoor exposure and livestock interaction.
- Round tanks work in open spaces; oval or elongated shapes fit tighter layouts. Consider fence lines, doors, or vehicle clearance.
- Distinguish between water troughs and automotive fuel tanks. Avoid using fuel-storage designs for water needs and vice versa.
- Level ground, drainage planning, and secure anchoring impact stability. Plan for potential shifting during weather events.
- Look for easy-to-clean interiors and surfaces resistant to algae growth or residue buildup.
FAQ
- What size stock tank should I buy for two horses? A larger capacity tank, such as a 40–50 gallon model, is typically better for single-herd watering, but confirm your horses’ water needs and space.
- Are these tanks suitable for outdoor use year-round? Yes, many are described as heavy-duty and outdoor-ready, but ensure proper placement on a level surface and consider weather protection if extreme conditions occur.
- Can I use a stock tank as a pool? Some models are used for DIY pools or baths, but verify material safety and applicable use with the manufacturer for water and skin contact.
- Do these tanks come with drainage options? Drainage features are not specified in the provided data; plan for drainage or water removal methods separately if needed.
- Is there a best choice for livestock watering? For durability and capacity, a 50-gallon Rubbermaid stock tank is a solid, mainstream option, with alternatives offered for specific space or vehicle-use needs.
- How do I choose between round and oval tanks? Round tanks are common and stable, while oval tanks suit narrow placements or walls; pick based on space constraints and layout considerations.