Use this great High Pressure 19 cu ft. spare tank when in any type of emergency situation. Features of this fantastic tank include: A must have for your dive Comes with High Pressure design valve 19 cu ft. Pressure: 3000 PSI Length: 20.4 with valve attached Diameter: 4.38" Weight with valve: 7.8 lbs Buoyancy full: -1.3 lbs Buoyancy empty: -0.3 lbs Water volume: about 2.7 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 Make sure your next dive is a safe one with this great emergency tank. **You can opt to replace this with an upgrade to a converter valve."