Most new regulators are coming with 2 types of knobs. Are these a
risk  for  safety  ?  SCUBAPRO,  for  instance,  had  a recall on
regulators due to a safety risk on a knob.

What is the advantage of these knowbs, anyway ?
Do  we  need these knobs for venturi effect and easy-of-breathe ?
Or this is just a marketing "trick" of the industry ?

What do the DIR folks say about these knobs ?

What are the regulators which control by themselves both of those
functions ?

Oh, Aldo again with his damned questions !! :-)

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