Converts Standard Hose to Scuba pro Air 2 Quick Disconnect Connector (A139) Scuba Pro Air 2 Quick Disconnect Connector HP Hose/ BC Inflator-Octo Adaptor (Scubapro Air 2) Convert Any Standard Regulator Hose to an "Scubapro Air 2 Style" QD Hose Installs to Second Stage End of Regulator Hose Chromed Brass Construction