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How to Remove the CO2 Cannister Safely


U.S. Consumer Product Safety Commission

Office of Information and Public Affairs Washington, DC 20207

March 24, 2004
Release # 04-105
CPSC Consumer Hotline: (800) 638-2772
CPSC Media Contact: Ken Giles, (301) 504-7052 or Eric Criss, (301) 504-7908

CPSC Issues New Safety Warning for Paintball Guns

WASHINGTON, D.C. – Based on its investigation of two deaths caused by carbon dioxide (CO2) canisters flying off paintball guns, the U.S. Consumer Product Safety Commission (CPSC) is issuing a new warning. Paintball gun users should be advised that the brass or nickel-plated valve that connects directly to the canister must not be unscrewed from the canister when removing the canister assembly from a paintball gun. This valve must stay secured and rotate with the CO2 canister.

In both of the deaths investigated by CPSC, the brass valve unscrewed from the canister, turning the pressurized canister into a deadly projectile. In June 2003, a 15-year-old boy died after being struck in the head by a paintball CO2 canister as he was removing the canister from the gun. In February 2004, a female bystander was killed by a CO2 canister that was expelled as someone else was removing the canister from a paintball gun. While these investigations are not complete, CPSC is issuing this new safety warning to help people avoid the hazard.

“We are very concerned about the recent deaths associated with paintball gun canisters,” said CPSC Chairman Hal Stratton. “We are actively investigating these cases. Even though our investigation is not complete, we believe it is urgent to provide this new safety message about the valve detaching from the canister while unscrewing it from the paintball gun.”

CPSC also recommends that people make sure that any modifications to the paintball gun or the CO2 canister are done properly. For example, installing anti-siphon tubes involves removing and re- installing the canister valve. It is critical that the valve be re- installed with the appropriate adhesive and the proper torque.

  • Make sure the brass or nickel-plated canister valve is securely attached to the canister, rotates with the canister, and does not unscrew from the canister.

  • The canister assembly should unscrew from the paintball gun in about three or four full turns; if you finish the 4th full turn and the canister is not unscrewed from the gun, stop! Take it to a professional.

  • Some people have used paint or nail polish to mark the brass valve and the CO2 canister so they can see that the valve and the canister rotate together while being removed from the gun.

Figure 1: Paintball gun and carbon dioxide (CO2) canister.

Figure 2: Brass or nickel-plated valve must remain connected to the CO2 canister.

Figure 3: Painted line between valve and CO2 canister.

Figure 4: Painted lines separating. The painted lines must stay together as you unscrew the canister assembly from the paintball gun. If the lines separate, stop unscrewing the canister and take the gun to a professional. If the valve unscrews from the canister, the canister can become a deadly projectile.


Send the link for this page to a friend! The U.S. Consumer Product Safety Commission is charged with protecting the public from unreasonable risks of serious injury or death from more than 15,000 types of consumer products under the agency's jurisdiction. Deaths, injuries and property damage from consumer product incidents cost the nation more than $700 billion annually. The CPSC is committed to protecting consumers and families from products that pose a fire, electrical, chemical, or mechanical hazard or can injure children. The CPSC's work to ensure the safety of consumer products - such as toys, cribs, power tools, cigarette lighters, and household chemicals - contributed significantly to the 30 percent decline in the rate of deaths and injuries associated with consumer products over the past 30 years.

To report a dangerous product or a product-related injury, call CPSC's hotline at (800) 638-2772 or CPSC's teletypewriter at (800) 638-8270, or visit CPSC's web site at To join a CPSC email subscription list, please go to Consumers can obtain this release and recall information at CPSC's Web site at

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