2nd Stage Quick Disconnect system

To use when you have different second stages regulators for different configurations and they are not always attached to your low-pressure hose, you might want to install a quick-disconnect (QD) fitting so you won't need to use a wrench. When you swap out second stage regulators and are changing them out with a wrench any repair technician can tell you if it is not done correctly you can de-tune your regulator and not even know it! The Second Stage Regulators Critical Valve Seats usually seals against the second stage inlet fitting. This fitting can be accidentally turned if you do not first place the appropriate wrench on its wrench flats before turning the hose fitting with another wrench. Failure to use two wrenches when removing a hose can drastically change the valves opening effort, rendering the second stage unfit for safe diving.