Here's an assertion that I'm not too sure of.  Why are the thin threads
of the DIN valve so much more secure than the threads on the yoke screw
and/or the brass form on the yoke itself?  Note that I dive with a DIN
valve, I'm just not sure that it's all that much more secure than a
properly designed yoke.


Dave: The Din Valve "traps" the o-ring instead of letting just sealing on its 
own.  The yoke can be knock out with nothing to secure it.

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