You cannot breathe directly out of a scuba tank because of the high pressure. A regulator reduces pressure to safe a level that can be inhaled by the diver. A diving regulator has two parts: the First Stage reduces the tank pressure and connects it to the Second Stage which contains the mouthpiece for breathing
If you believe that you shouldnt have to sacrifice performance for price, the Alpha 8 Sport is for you. The Alpha 8 Sport is the top-performing regulator in its class, and one of the most affordably priced regulators you can buy. FEATURES The best price-to-performance ratio in its class Designed to perform to the U.S. Navys Class A standards at 198 feet Inexpensive to maintain SPECIFICATIONS Valve Type DEMAND Adjustment N/A Balancing System N/A Integrated Purge Button YES Mouthpiece ORTHODONTIC Nitrox Compatibility STANDARD TO 40% AmbidextrousN/A Integrated SwivelN/A Weight (without hose) 6 OUNCES Dimensions (front profile) 2.9 INCHES First Stage Configurations PX-2/SP-4 Minimum Cracking Effort 1.1 CIW* Factory Set Inhalation Effort 1.2 - 1.4 CIW* Work of Breathing 1.23 JOULES (PX-3) 1.47 JOULES (SP-5) Warranty 2 YEAR Limited Lifetime Service Agreement YES 30-Day Satisfaction Guarantee YES Does not come with hose!