Check the listing for details. 0.5L Mini Diving Tank Breath Underwater Device Diving Cylinder Diver Inflatable. Color: Green, Condition: New. Listed at 169.95 USD. Mini 0.5L Breathing Oxygen Tank Oxygen Cylinder Diving Teaching Scuba Equipment [Capacity] 0.5L capacity diving cylinder, constant pressure breathing is more stable and lasting. [Pressure gauge] With luminous function, it is still clear at 30 meters underwater, stainless steel material is waterproof, corrosion-resistant, high hardness, and durable under pressure. [High-pressure gas storage tank] Choose aviation aluminum material, professional organization inspection and certification, the surface adopts plastic spraying process, high pressure resistance, impact resistance, seawater corrosion resistance. [Secondary pressure reducing valve] The surface is hard-oxidized and hardened, which is resistant to stamping, corrosion, and lasting stability. [360° rotating head] 360° free rotation