AIR BALANCED FLOW THROUGH PISTON - The first stages with balanced air pistons deliver significantly more air to the second stage than any other first stage, while its performance is completely unaffected by the change of tank pressure. A balanced piston allows the use of lighter, more sensitive components, resulting in ultra-fast breathing response, instant on-demand air delivery and extra high air flow, especially in low tank pressure ranges. Tired diver benefits from a smoother breathing regulator during ascent or decorative stop. The early stages of the balanced piston are the first choice of demanding and professional sports divers. A balanced piston works equally in hot and cold water environments.