The Mk25 delivers in all water temperatures and all diving conditions!!
First Stage : Air-balanced flow-through piston in a full titanium body provides effortless airflow unaffected by depth, tank pressure, or breathing rate
Spring insulating coating, body insulating bushing, anti-freeze cap, bigger body and cap thread all work in concert with the XTIS to improve cold-water performance
Second Stage: Air-balanced valve smooths out the inhalation effort at varying depths and supply pressures
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