The UNS CO₂ Cylinder Pro (5LB) is a compact, heavy-duty aluminum gas tank engineered to give planted-tank hobbyists reliable, long-lasting CO₂ delivery without the bulk. Lightweight, corrosion-resistant, and easy to handle in humid cabinet environments, it serves as the ultimate sweet spot for dedicated pressurized systems.
*Important Notice: All UNS CO₂ cylinders are sold and shipped EMPTY due to federal transport regulations. Before ordering, please verify that a local welding supply store, homebrew shop, fire extinguisher service, or paintball center near you fills or exchanges standard CGA320 aluminum CO2 tanks.
Note: Gas depletion rates vary based on target bubble count, photoperiod duration, plant mass, and aquarium volume.
| Attribute | Specification |
|---|---|
| Brand | Ultum Nature Systems (UNS) |
| Model | UNS CO2 Cylinder Pro (5LB) |
| Gas Volume Capacity | 5.0 lbs (2.27 kg / 3.35 L) |
| Material | Brushed Aluminum Alloy |
| Valve Stem Thread | Standard CGA320 (North America) |
| Safety Certification | DOT3AL Certified |
| Working Pressure | 124 BAR / 1,800 PSI |
| Test Pressure | 207 BAR / 3,000 PSI |
| Cylinder Height (Without Valve) | 14.53 inches (369 mm) |
| Empty Weight (Without Valve) | 6.61 lbs (3.0 kg) |
1. Does the UNS 5LB CO2 Cylinder arrive pre-filled with gas?
No. Federal shipping regulations prohibit the transport of pressurized gas cylinders. All cylinders are shipped empty and must be filled or swapped locally at a welding supply company, fire protection shop, or homebrew supplier before use.
2. How long will a 5LB CO2 tank last on a planted aquarium?
On a standard 29- to 40-gallon planted aquarium running a standard 1 to 2 bubble-per-second rate for 8 hours daily, a 5LB cylinder typically lasts between 6 to 9+ months before requiring a refill.
3. Will this cylinder work with regulators from other brands?
Yes. The UNS CO2 Cylinder Pro features standard CGA320 threads, making it universally compatible with any North American CO2 regulator designed for standard aluminum cylinders (including UNS, Flipper, FZONE, and CO2Art regulators).
Setting up pressurized carbon dioxide is far simpler than it appears! Explore our step-by-step guides to master your setup:
Overall rating: 5.0 / 5 from 8 reviews.
Review topics: ["shipping","looks","cylinder","tank","supplies"].
"Professional looking CO2 cylinders - expensive but nice looking - as per my local refilling supplier this are the same/equal materials as the regular cylinders so I guess you are paying for a brand"
"Works just as a Cylinder should. Looks a lot better than other cylinders. Shipping was fast and well packaged. Thanks Buce Plant! There’s a reason I keep coming back!"
"The tank is so clean n perfect looking . Can't ask for a more."
"Beautiful tank. Shipped fast and packed well."
"Looks beautiful! Quite a bit larger than I expected."
"This Product Rocks! Looks very sleek"
"The 5lb tank arrived in perfect condition. Unfortunately, I was unable to find a CO2 refill source to fill my tank. I went to three of the closest suppliers only to learn that they don’t fill tanks any longer. Instead, they only exchange tanks. After three attempts, I ended up exchanging my brand new tank with an ugly, gray tank. Oh well, lesson learned. Check your local supplier first before buying your CO2 tank."
"Delivery was fast and speedy, items were package well and items are in great condition. Bought this for my sons birthday, but I’m sure he’s going to love it"
