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Great size for primary child’s cylinder or instructional pool cylinder Catalina 53 cu. ft. 7.6 liter Aluminum Tank with Pro Valve. Cylinder comes with a K Pro Valve which is one of the highest flow cylinder valves available today and is also a convertible valve. Whether you dive Yoke or DIN regulators this valve will work for both. Valve has easily removed 200 bar DIN-insert to convert the valve for use with DIN regulators. Valve has a heavy duty deign with a smooth operating mechanism and multi-ported burst disc plug for added safety. The K Pro Valve is nitrox compatible up to 40%. Aluminum cylinders unlike steel cylinders don’t rust they oxidize. The oxidization of aluminum forms a protective coat that hinders the continuation of corrosion making aluminum cylinders less likely to be condemned due to excessive corrosion. Purchasers should check with other country requirements to know if the cylinders are certified for use in that country.The 53 cubic foot 7.6 liter cylinder is a 3000 psi 207 bar rated tank that measures 19.2″ 48.77cm in height with a 7.25″ 18.4cm diameter. The tank weighs 25.1 lbs 11.39kg and is negatively buoyant 3.8 lbs 1.72kg when full and negatively buoyant 0.8 lbs 363g when at 500 psi 50 bars.