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
The Abyss 52X regulator combined with the 52X first stage means the best for a high-caliber set up! The double DFC system provides a consistent airflow. Added to an NCC system and more metal on the Abyss' cover, it achieves very high performance in cold water!