Technical Divers need redundant safety back-ups on most all their equipment to assure the safest dive techniques allowed. A First-Stage Regulator should work well when it is maintained properly, yet if it does malfunction added safety features can make thedifference between a controlled emergency and a diving accident. Incorporating a safety relief valve on your First-Stage regulator allow an over pressurization of the 2nd-Stage Hose nearly imposable. OMS's OPRV will not allow an over pressurization of the 2nd-stage or any other LP hose attached to your first stage regulator. This OPRV is set to relief pressure at 180 psi (12.4bar), made of chrome plated brass and stainless Steel it threads into a standard 3/8" LP Port. This spring loaded valve will give you the safety edge you need as a technical diver.