6 cu ft 3000 PSI Aluminium High Pressure Spare Emergency Tank Cylinder with Valve for Scuba Diving Pony Bottle AUTHORIZED DEALER, FULL MANUFACTURER´S WARRANTY!!! A must have for your dive Comes with a yoke design valve, 6 cu ft., about 0.9 liters, Pressure: 3000 PSI, Length: 10.80", Diameter: 3.21", Weight with valve: 3.14lbs, Buoyancy full: -1.5lbs Buoyancy...

We have all come to know the familiar sound of the helicopter overhead that is flying quickly from the scene of a tragic car crash to the nearest trauma center at a nearby hospital. We may have even known someone who has needed to utilize such air ambulance service. Do you know the history behind these marvelous methods of medical transportation? Think...