Used Ocean Reef Octopus -Secondary Regulator with Quick Connection Hose Color YellowThis backup second stage is balanced, has a standard downstream valve with a dive predive switch, and comes with a male quick connection part, and a quick connection 120cm 48 QC Extraflex Yellow hose. Every IDM diver, especially if diving with QCs or Buddies with QCs should have the option, if needed to bail out with secondary conventional second stage, or QC hard connection.