320 CGA Certification: The 320 valve is CGA certified and has external threads compatible with CO2 regulators. Gaskets are included as a gift to prevent gas leaks more effectively. Dual Certification: The aluminum Co2 tank's exterior is covered with double certification marks from the US Department of Transportation (DOT) and the Canadian Transportation Department (TC). Strong Stability: A 5-pound gas can hold approximately 6-8 small barrels of beer. The working pressure of each aluminum cylinder is up to 1800 PSI/124 BAR, with a test pressure of 3000 PSI/207 BAR. Gray Powder Coating: The CO2 tank's outer layer is coated with gray glossy powder epoxy resin, which is more beautiful and durable and prevents corrosion and abrasion of the bottle body. High-Quality Aluminum Alloy: 8.8-pound aluminum carbon CO2 cylinder dispensing draft beer and other beverages. The bottle body is made of high-quality new aluminum alloy, lightweight and corrosion-resistant. (Friendly Reminder: This CO2 tank is empty, not be filled with gas!)