Prices can vary a lot based on what you need. A few things that typically affect cost include:

• Size and type: Small disposable cartridges (12g, 90g) differ from refillable cylinders (12–24 oz, 5–10 lb).
• Material: Aluminum is common and lighter; steel can be more rugged.
• Valve and compatibility: Pin valves for paintball, CGA320 for beverage systems, or threaded connections.
• Certifications: Look for DOT or similar markings noted on product pages.

It can help to compare listings, use filters, and consider long-term value if you plan to refill. Many refillable tanks ship empty, so factor in the cost of a first fill and any needed adapters or regulators.

Refill options can depend on your location and tank type. A few common places include:

• Beverage and carbonation suppliers: Often refill CGA320-equipped cylinders used for soda and draft systems.
• Paintball or airsoft shops: May offer fills for small paintball tanks.
• Industrial gas providers: Sometimes refill CO2 cylinders; availability varies by region.

Call ahead to confirm services, bring your tank with a readable inspection date, and transport it upright with the valve protected. If refilling isn’t convenient, single-use cartridges are an alternative you can order online for delivery or pickup. Always follow the tank’s instructions and local regulations.

Start with how you’ll use it and how portable you need it to be:

• Paintball and airguns: Smaller tanks (12–24 oz) or disposable cartridges keep gear light; some setups use 90g cartridges with adapters. Compressed air cylinders (e.g., 48ci) are also common for certain markers.
• Beverage systems: Stationary setups often use 5–10 lb cylinders for longer runtime.
• Compatibility: Match the valve type (pin valve, CGA320, threaded) and any regulators or adapters your equipment requires.

Check your equipment’s manual for specific recommendations and use site filters to compare sizes, materials, and certifications before you buy.

They serve similar purposes but behave differently:

• CO2 tanks: Store liquid CO2 that turns to gas as used. Pressure varies with temperature, which can affect performance. Common for paintball, airguns, and beverage carbonation.
• Compressed air (HPA) tanks: Store high-pressure air (often 3,000 psi) and are labeled by volume (e.g., 48ci). They offer more consistent pressure across temperatures and are preferred or required by some markers.

Your choice depends on your gear, desired consistency, and environment. Check your equipment’s requirements and compare the types available to find what fits your setup.

Runtime can vary widely based on the application and settings. A few factors to consider:

• Usage: Beverage carbonation and dispensing versus powering markers or airguns consume CO2 at different rates.
• Regulator and temperature: Pressure and temperature influence CO2 delivery and efficiency.
• Leaks and maintenance: Proper seals and fittings reduce waste.

To estimate, track your usage over time—note pours, shots, or hours of operation—and weigh the tank before and after sessions to gauge consumption. Checking your equipment manual for typical usage rates can also provide a helpful starting point.