Place the failure pt aside for the moment. You are openly admitting that you are able to close the valve as it stands before use of this device so you are adding 'unnecessary equipment' and further congesting the chest area (you don't leave stage and deco regs parked off on the shoulder d rings do you?). Its a systems approach and you start to clutter the system and it breaks down as in attaching *unneeded* things to your chest area. I strongly consider this to be the most important reason not to do it. When the 's#&*' hits the fan, you need focused options (the fewer the choices, the better the reaction time). Cluttering the chest area delays the deployment of *all* safety equip in that area.... back up lights, your device, regs if you park them there (as I have stated this should not be done and is a fundamental cause of ox tox or breathing an inappropriate mix no matter how good you are). Take the time and keep the house clean and you will be better off.
Originally posted by Alban
As far as i can see the main problem everyone see's is " an added failure point "
As for it being an engtanglement it runs from the isolator over my shoulder and is clipped to my harness it is not balloning out anywhere . so much attention is placed on us to place vital equipment on our chest area where it can easily be reached with either hand eg. gauges , knife, sissors, inflators you must agree that reaching the isolator valve is time critical and anything that improve this must be a benifit ?
As I have said before i am not sugesting that this is used instead of performing a shut down I use it as an aid i still need to be able to reach the tank valves to close them