The OTS 90 Degree Elbow is designed to be mounted between the second-stage regulator of a Scuba regulator or second stage for a full-face mask (FFM). Does your regulator second stage feel uncomfortable in your mouth when diving? Does it feel like it is trying to pull out of your mouth when you turn your head? Does the FFM seem to gravitate to one side when you turn your head? If these are problems, you have experienced when diving than you may need an OTS 90 Degree Elbow. Elbow re-routes the low pressure (LP) hose for better trim and comfort while diving. The Elbow also makes connection of the LP hose easier, reduces wear and tear on the second stage and produces less torque on the inner valve. Elbow is easy to install with standard wrenches, is made from corrosion resistant stainless steel.