Scubapro Diaphragm vs. Piston First Stages - LeisurePro

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Difference between diaphragm and 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.

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