Use this great High Pressure 13 cu ft. spare tank when in any type of emergency situation. Features of this fantastic item include: A must have for your dive Comes with High Pressure design valve 13 cu ft. Pressure: 3000 PSI Length: 15.8 with valve attached Diameter: 4.38" Weight with valve: 5.7 lbs Buoyancy full: -1.7 lbs Buoyancy empty: -1.0 lbs Water volume: about 1.9 liters Sherwood Valve model #5000K-48 High visibility yellow makes it easy to locate Attach your regulator or octo for a complete high pressure, emergency tank Model #AL13 Make sure your next dive is a safe one with this great emergency tank.