One of the best features of Spare Air is that you can simply and easily refill it yourself - allowing you to be in control of your own safety! This allows you to fill your Spare-Air directly from any standard scuba tank. The Refill Adapter is made of corrosion resistant chromed brass and other materials with a large yoke knob that is easy to turn even with gloved hands. Spare Air is easily refilled from your own SCUBA tank in about 1 minute. There is no need to make a separate trip to the dive store to get Spare Air refilled. Adapter is also easy to travel with so you can bring your redundant air system with you when you travel. Either fill empty Spare-Air or top off its air pressure to 3000 psi (200 bars).