Regulator (2nd level)



  • The second level reduces the air pressure it received from the first level and it only releases as much air as the diver needs trough inhaling. The second level includes a valve that opens as soon as the diver inhales. The force that is exerted on the valve by the air that is streaming in and opens the valve is called downstream-force. Antagonist to this force is a force exherted by a feader that is offset only when the diver is inhaling when he is in need of air. The result is: The lower the pressure from the bottle, the more inhaling work is needed in order to offset the counterpressure of the feather.
  • Various producers have solved the problem to maintain a constant breathing independent on the cylinder pressure in different ways. Do take advice.


  • Stainless steel, alluminium, synthetic material, fiberglass


  • The most importent factor is: how easy is it to breath with it (breathing comfort)? Furthermore, pay attention to: How easy is it to handle the regulator when wearing gloves (air shower), is it possible to assemble the mean pressure tube in the left as well as in the right position, is it possible to adjust the valve manually (dive/ pre-dive function prevents the unintentional blow-off of the regulator during preparatory stage before the actual dive), is the inhale resistance steplessly variable by the diver himself, is the valve face in constant contact with the sealing part (see maintenance), how aerodynamically efficient are the membranes for in-and exhaling set, does it feel comfortable wearing the mouthpiece?


  • During a linger non-use, the valve face that is made of soft elastomer may get damaged and become leaky as it is in permanent contact with the sealing part of the valve. When being reattached to the regulator, it might blow-off. Have an expert fix this.