http://www.k2scuba.com/product_description.php?category=1&sub_cat=78&...
Mares first stages are equipped with the exclusive DFC system, making it possible to minimize intermediate pressure drop during inhalation, demonstrably improving the regulator's performance in every condition, including high demand situations. This means that the regulator remains easy to breathe with, especially when you need it the most. The DFC system, by guaranteeing more stable intermediate pressure, makes it possible to use simpler, more reliable second stages. Mares regulators do not require any type of manual adjustment of the second stage, thanks to the consistency derived from first stages that guarantee a stable flow of air, even under extreme conditions.
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