This NOS powder coated electric blue bottle is a dot-approved nitrous bottle with hi-flow valve. The bottles valve is NOS/CGA-approved and features a built-in siphon tube. For extra safety, NOS has designed an exclusive blow-off venting system. If your bottle is overfilled or if pressure increases beyond the maximum safety level, the vent opens and discharges the nitrous into a safe place. This bottle weights 14 pounds, 12 ounces empty, and 24 pounds 12 ounces full.