A unique system combined with a particular position is a combination that offers only advantages. The SF2
ECCR has a bellows system protected by the lower carbon tube. The counterlung is, therefore, inside and
cannot be damaged, and it does not matter if the diver dips through the tightest restriction in a cave or
is inside a wreck.
Despite the unusual position, the SF2 ECCR offers excellent breathing comfort. The WOB tests of the CE
certification are rigorous: The SF2 ECCR has passed all tests in all positions excellently. The tests were
also carried out in Germany at DEKRA. Again, no cheap "compromises" were made. The internal counterlung is one reason for the streamlined structure of the SF2 ECCR. The lower the water resistance, the more comfortable diving is – a factor
that any diver appreciates, not just technical divers.