This is the XS Scuba 90 Degree Adapter with Swivel Features: This is a combination of the AC910 and the AC912 Rotating swivel action at the end of a 90Adeg adapter Installs between low pressure regulator hose and second stage Chromed brass construction Low pressure use only - below 200 psi Factory cleaned - Viton o-rings This Adapter makes a more comfortable feeling and can eliminate the pulling" effect of the regulator found with hoses without a Swivel Adapter."