UNS CO2 Cylinder Pro - 2.5LB

The UNS CO₂ Cylinder Pro (2.5LB) is a heavy-duty, premium aluminum tank that supports thriving, high-tech planted aquariums. Lightweight, corrosion‑resistant, and easy to handle, it’s an ideal upgrade for hobbyists moving beyond disposable cartridges or running smaller pressurized systems.

Key Features & Benefits

• A dedicated manual on/off twist valve gives you complete control over the tank opening, so you never have to worry about sudden leaks during installation.
• Lightweight brushed aluminum construction provides a clean, rust-free look that easily handles the humid environment inside an aquarium cabinet.
• The 2.5-pound capacity strikes the perfect sweet spot between a long-lasting gas supply and a compact footprint that fits into smaller stands.
• Official DOT3AL certification guarantees the cylinder meets strict safety and pressure standards for worry-free operation in your home.

Product Specifications

• Gas Volume Capacity: 2.5 lb / 1.68 L
• Regulator Compatibility: Fits all standard CGA320 threaded regulators (Note: While it technically fits both the Mini and Pro UNS styles, this size cylinder is most commonly paired with the UNS Pro Dual Stage Regulator for larger aquariums).
• Material:  Aluminum
• Safety Certification: DOT3AL Certified
• Working Pressure: 139 BAR / 2015 PSI
• Test Pressure: 232 BAR / 3364 PSI

Technical Specifications

Please note that gas depletion rates will always vary depending on your target bubble count, plant density, and tank size.

• Cylinder Height (Without Valve): 280 mm/11.02"
• Cylinder Weight (Empty / Without Valve): 1.75 kg/3.86 lb

**Important Note: All UNS CO₂ cylinders are sold and shipped empty due to shipping regulations. Before ordering, we highly recommend checking your local area for a certified welding supply shop, homebrew store, or paintball shop that can fill standard CGA320 aluminum CO₂ tanks for you!

Sizing Recommendations

• The Mini Setup: UNS Paintball Cylinders + UNS Mini Dual Stage Regulator (Best for nano tanks, tight cabinet spaces, or desktop scapes).
• The Pro Setup: UNS CO2 Cylinder Pros + UNS Pro Dual Stage Regulator (Best for larger displays, high-tech demands, and maximum long-term pressure stability).

What’s in the Box?

• 1x UNS CO₂ Cylinder Pro (2.5LB)

Team Buce Plant Tips

Fine-tuning your CO₂ setup can seem intimidating at first, but the process is far simpler than it appears. For a safe and reliable introduction, refer to our guide on How to Add CO₂ to Your Planted Aquarium . And if you’re curious about the science behind why CO₂ makes your buce, stems, and carpets thrive, explore The Mysteries of CO₂ in a Planted Tank Explained for a clear breakdown.