The T10-SEAL CHAMBER 1ST stage is environmentally sealed, protecting it against icing in cold water and against contamination from particulate matter in silty conditions. When paired with the Ellipse Balanced second stage, which includes an internal heat exchanger, this regulator is an excellent choice for divers exploring the most extreme cold water environments. Performance, ergonomic reliability, and ease of maintenance make this regulator a product for true diving professionals. Instructors, guides, dive operators, and researchers will find the answer they need in the Master Ellipse. The first stage stands out from the range of Cressi balanced diaphragm regulators because the mechanism is arranged on an axis perpendicular to the axis of air entry, creating a “T” shape. The advantages of this particular design include better arrangement of the hoses and less space occupied (especially in SC versions for cold water). What’s more, this makes it remarkably easy to inspect and access the mechanism to improve maintenance and calibration operations, it uses a larger, high-efficiency conical filter, and the valves are arranged more easily on the tank. The metal body is protected on the surface by a special treatment called PVD (Physical Vapor Deposition), which compared to traditional chrome coatings is exceptionally resilient to the mechanical and chemical wear caused by dives. The DIN fitting has a generous metallic handwheel to make it easier to use in extreme conditions. The Master Ellipse second stage has installed the exceptional and proven Cressi balanced valve to ensure minimum inhalation effort. This valve is paired with a body with metallic parts treated in PVD. What’s more, the knob for adjusting inhalation effort is made of a metallic material to guarantee reliability and resistance to blows and scratches.