Diaphragm-based first stages are more complex and have more moving parts than piston first stages. With a dry chamber, they have an environmentally sealed design so that water cannot enter the inner mechanism.
Diaphragm first stages have been the favored choice of cold-water divers because of their better resistance to freezing. They are also recommended for divers working in water containing a high degree of suspended particles, silt, or other contaminating materials.
All our diaphragm first stages feature balanced technology and are packed with original features that deliver fast flow to the second stage upon demand and high overall performance.
This technology is used on:
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