Paintball CO2, N2, Air, and NOX cylinders, tanks or bottles are made to and comply with all DOT requirements for pressure and certification ratings. The cylinders come complete with the pin valve assembly and are ready to be filled. The weight in ounces given in the product description is the weight in ounces of liquid carbon dioxide which the cylinder is designed for. Over-filled bottles must not be be used; they must be bled to correct capacity before using.
Always use a Scale when filling. ALWAYS!