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MikeS once bubbled...
I converter my 30 cf pony to DIN because a didnt like the possibility of confusing the first stage regulator knob that tightens the yoke fitting, with the valve knob. The possibility of confusing the two is eliminated with a DIN valve.
maverick7593 once bubbled...
I have seen that happen on a training dive. As the guy went to turn on his deco bottle he accidently losened the yoke and the first stage came off in his hand. Luckily the deco mix wasnt required on this dive. He was just carrying the tank to practise using it.