In paintball you can find two different types of paintball tanks. Each type takes a certain type of air, and in turn can be pressurized at greater PSI's (pound per square inch).
Co2 Paintball Tanks - Co2 is one of the most abundant gasses in the world, and duly is the easiest to find. You won't have a hard time refilling a co2 paintball tank, which is one of the biggest reasons why players stick to co2. These tanks can come in 9oz to 20oz sizes, and are often made of steel or aluminum.
HPA Paintball Tanks - HPA stands for high pressure air, which includes nitrogen and compressed air. Air compressors are used to fill HPA tanks. HPA tanks are generally made out of carbon fiber, which is a light but durable material able to handle the high pressure. These paintball tanks are much more expensive.
 O-rings for paintball CO2 tank 100ct. O ring  US $4.99
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 HYBRID PAINTBALL TANK FILL NIPPLE TWISTERS COVER-BLUE US $8.50
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 PAINTBALL PAINT BALL GUN LOT MASKS CO2 TANKS SET BRAWLER DXS AIR SYSTEMS US $31.99
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 PURE ENERGY 20 OZ CO2 PAINTBALL GUN TANKS US $41.00
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 Ninja Paintball 48/3000 Compressed Air Tank US $90.00
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 RAP4 Paintball 20oz CO2 Tank Cover (Woodland Camo) US $8.96
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 RAP4 Paintball 88g BB Gun Air Tank Adapter US $19.50
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 BlackStar Paintball Tank Butt 2.0 - Cyan US $17.00
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 RAP4 Paintball CO2 / Air Tank Cap US $4.95
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 Pure Energy 3000PSI/ 68CU Carbon Fiber Paintball Tank and Coiled Remote US $62.01
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 Paintball Pressure Gauge,Tank Replacement 0-5000 psi US $8.99
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 new nitrogen paintball tank 4500 psi US $129.99
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 CP 68/4500 Paintball HPA Tank US $55.00
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 Ninja Paintball Tank Cover - 50CI - Black US $19.95
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 Paintball tank holder with leg strap US $.99
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