ScubaPro MK19 EVO/D420 Dive Regulator SystemOVERVIEW With the introduction of the new D420, SCUBAPRO engineers have combined the iconic design of the original D Series second stages with the latest advances in breathing performance technology. They then teamed it with the new MK19 EVO balanced diaphragm first stage to create a 21st century smooth, natural breathing regulator. The new D420 features a brand new balanced valve inside a housing supported by a full metal structure. Called the
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