Specification Brand : Acecare BulletPoint1 : ⭐Safe. We already did the Hydro test to her to eliminate your concern for her healthy when you got her. Every 5 year, she need to do the hydro test. BulletPoint2 : ⭐DOT certified. She was born according to D.O.T standard and she will be with you for 15 years if you treat her good and keep her in good condition. BulletPoint3 : ⭐New manufacture date. We do not keep a lot in stock, and we normally produce in ahead of 3 months, so our tanks are all produced in recent 3 to 4 months. BulletPoint4 : ⭐Light weight. She is aluminium alloy 6061 liner and wrapped with carbon fiber and glass fiber by FOUR-DIMENSIONAL THREE-SPINDLE WINDING MACHINE, and she is half weight compared with aluminum tank. BulletPoint5 : ⭐Multi-use: Loading gas, Emergency escape, Fire breathing, Underwater breathing, Lifesaving of ships, Clean energy, Snorkeling diving breathing, PCP rifle and Paintball filling, Medical care and Mine emergency etc. Widely for fire-fighting, chemical industry, shipping, laboratory, mine, pertroleum, warehouse, factory and metallurgy, it can be used in various positive pressure breathing apparatus. ItemName : Acecare Carbon Fiber Cylinder HPA Paintball Tank Air System 550Cu.in./9L DOT Approved 4500Psi with Valve & Cover for PCP Airgun ItemTypeKeyword : paintball-tanks Manufacturer : Acecare Pattern : Solid ProductDescription : It is a 9L DOT tank. Below are some detailed specifications: Water Capacity: 9L/550 Cu In/86 Cu Ft Certification: DOT approved Content: Compressed Air Diameter: 174mm, Length: 510mm, Empty Weigth: 5.1kg Material: Import carbon fiber Working Pressure : 4500Psi PT/PH: 7500Psi Retest : Every 5 years Cylinder Thread: M18*1.5