The Mares 52x First Stage Regulator is one of Mares’ flagship products and is proven to be a leader in the diaphragm design among first stages. It is specially designed with Tri-Material valve to guarantee the maximum safety and reliability. It is the only first stage in the world that has dual DFC or Dynamic Flow Control, a patended Mares feature to ensure utmost performance by minimizing drop of pressure during inhalation thru a venturi system. It is best paired with the Mares Fusion, Mares Carbon, or any alternate inflator and second stages it has been certified for.