To move air from your cylinder to your regulator’s second stage, a first stage uses either a piston system or a diaphragm system. Both can deliver excellent breathing performance; however, each has distinct advantages that are better suited to different diving situations. SCUBAPRO USA’s Technical Manager Rene’ Duprè explains.
http://www.scubapro.com/en-US/USA/regulators.aspx
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cool
Excellent instructor, gives seminars around the U.S. Must schedule!
What is considered “cold” for the purposes of a regulator? Or asked another way, at what temperature and below do you need to start looking at regulators with stated cold water performance?
Unbelievable professor. I highly recommend going to one of his seminars.
finally..
Let’s go diving!