4500PSI 300Bar 30MPA 2.5L Carbon Fiber Cylinder High Pressure Air Tank Scuba Diving M181.5. Model Number: 2.5L. Actual Volume: 2.5L. Straight Thread Bottle Mouth: M181.5. Working Pressure: 300 BAR. Hydraulic Test Pressure: 500 BAR. Design Working Life: 15 Years. Re-Test Period: 3 Years. Fiber Material: Carbon Fiber. Liner Material: 6061 Aliuminum Alloy.