You added the XS Scuba Stainless Steel 2nd Stage Quick Disconnect adapter to your regulator and love the quick disconnect feature, but your regulator second-stage feels uncomfortable in your mouth when diving. It feels like it is trying to pull out of your mouth when you turn your head. If these are problems, you have experienced when diving than you may need a swivel adapter added to your QD fitting that can eliminate this problem. This QD fitting with swivel allows attachment of another second stage regulator to a single hose. QD is manufactured from durable stainless steel for low maintenance and long life. QD is factory cleaned, has Viton O-rings, so it's ready-for-nitrox out-of-the-box. Designed for low pressure only below 200 psi (13.8 bars).