SCUBAPRO Diaphragm vs. Piston First Stages

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.


dennie lempoy says:


Andrea Dupre says:

Excellent instructor, gives seminars around the U.S. Must schedule!

John Vanderbeck says:

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?

fabio januario says:

Unbelievable professor. I highly recommend going to one of his seminars.

Rui Dong says:


Jeff Adams says:

Let’s go diving!

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