Thank you for the information! I already own this piece, trying to safely find a new home for it.The Air 2 is basically an alternate 2nd Stage / Octo that is integrated into the BC inflator hose mechanism. There are mixed opinions here on SB on the use and effectiveness of this function. No offense intended......but if you are asking this question then I would recommend that you to seek advice and evaluation from a qualified shop / instructor before proceeding with this decision and this purchase.