This is the XS Scuba Swivel Adapter LP Available in Brass OR Stainless Steel Features: Install between low pressure regulator hose and second stage Reduce hose torque on the second stage leading to increased comfort and reduced jaw fatigue and clinching Rotating swivel action Assembled with Viton o-rings Low pressure use only - below 200 psi XS Scuba&';s Swivel Adapter makes your primary second stage regulator more comfortable while you dive.