3.0 cubic feet of air.Tank finish in durable Anodized Black.Easily refills from your own SCUBA tank with included refill adapter (patented).Easily attaches to your BC with included holster and safety leash.Small, hands-free, nearly neutrally buoyant.Breathe on demand regulator - No complicated instructions.Completely redundant back-up miniature SCUBA system.Faster than buddy breathing and easier than an octopus.SpecificationsMaximum Capacity:3.0 cu ft / 85 litersLength:13.4" / 34 cmDiameter:2.25" / 5.7 cmMaximum Pressure:3000 psi / 207 barWeight (full):2.2 lb. / .98 kgSurface Breaths:*57Water Volume:27 cu in / .44 liters Nitrox ready up to 40% EANDurable 3.0 cu. ft. black anodized aluminum cylinder labeled in green Nitrox markingsRefillable to 3000 psi off any Nitrox scuba tank or air compressorOne of the best qualities of SPARE AIR is the ease of filling it from your own tank, and if you dive Nitrox, it only makes sense to fill your SPARE AIR with NitroxPackage Includes:Nitrox SPARE AIR breathe on demand, balanced single stage regulator3.0 cu.ft. Black Anodized Aluminum CYLINDER with Nitrox Label910S REFILL ADAPTER - Fills off Nitrox SCUBA tank973 COVERED HOLSTER - Mounts to BC961 LEASH - Prevents loss Product Specifications:Part Number300PK-NProduct Length13.4" [34 cm]Product Diameter2.25" [5.7 cm]Product Weight (full)2.2 lbs [.98 kg]Cylinder Pressure Ratings3000 PSI [207 BAR]Cylinder Volume3 cu ft [85 liters]Cylinder MaterialAluminum - Black AnodizedPressure ReliefIntegrated in regulatorRegulator TypeBalanced Single StageOperational Temperature-22AdegF [-30AdegC]+158AdegF [+70AdegC]Duration of Air SupplyApproximately 57 breaths at surface