This is the XS Scuba LP Angle Adapters Features: Installs between low pressure regulator hose and second stage Increase comfort and reduce jaw fatigue Used to improve regulator hose routing Often used to set up underarm routing of primary regulator hose Chromed brass construction with Viton o-rings Low pressure use only - below 200 psi XS Scuba&';s Angle Adapter makes your primary second stage regulator more comfortable while you dive. Adapter is installed between your second stage and the regulators low pressure hose and allows you to route the hose under your right arm instead of over the shoulder. This Adapter makes a more comfortable feeling and can eliminate the pulling effect of the regulator found with over the shoulder routing.