XS Scuba Aqua Lung/SeaQuest QD Adapter.

Features: 

• Convert any standard regulator hose to an “Aqualung/SeaQuest Style” QD hose
• Installs to the second stage end of a regulator hose
• Chromed brass construction with Viton o-rings
• Low pressure use only - below 200 psi 

Compatible with: Aqualung/SeaQuest Air Source, Oceanic Air XS 2, US Divers Air Mic, Mares Air Control