Supplied by OmniSwivel International, the regulator quick connection adapter attaches to the standard 9/16-inch threads found on most second stages, where the low pressure hose would normally attach, and the other end has a standard BC inflator male QD post. This tool allows a diver to plug a second stage into the rebreather manual addition hose to allow access to the onboard gas supply. Typically the adapter would be used to gain access to the onboard oxygen but could be used for shallow access to diluent as well. The 2nd Stage Quick Connection Adapter will not supply adequate gas if the diver is deeper than { 20 ft | 6 m }.