This is the XS Scuba AltAir Octo Scuba Diving Octopus Features: Exclusive X-Lock attachment Intelligent, inline mouthpiece orientation Reliable, free flow resistant design Choose 36 yellow Miflex or 36" black rubber hose Choose 36" yellow Miflex or 36" yellow rubber hose The AltAir utilizes the same patented quick-release buckles used on today&';s modern weight integrated BC&';s. Just grab and pull the AltAir, that&';s all that is needed to release the patented X-Lock buckle."