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D400 Elite Series A total departure from conventional regulator design, the D400 is for the diver who demands the best. This is SCUBAPROs premiere second stage, with features that go far beyond its futuristic appearance. The heart of the D400 is an exclusive air-balanced coaxial flow valve, which is extremely smooth as well as sensitive. The rugged fiberglass-reinforced polyester case is shaped to take full advantage of VIVA, which is preset and requires no adjustment. A rubber cover protects the diaphram/exhaust assembly, cushions the regulator from damage, and provides a soft, flexible purge surface for easy access. Its extremely light in the water, with the lowest drag profile of any SCUBAPRO second stage. A dive/pre-dive switch de-tunes the regulator for surface swimming, while the anti-surge diaphram prevents unintentional freeflow. Although not normally touted as a cold water second stage, the D400 also performs extremely well in frigid waters. The overall result is an unbeatable combination of high performance versatility and overall handling comfort in all diving conditions. First stage Mk 18 Diaphragm P.A.S.S. - [Piston Assisted Seat] SCUBAPRO’s new Piston Assisted Seat technology rewrites the rules on diaphragm regulator design. On conventional diaphragm regulators, a flat seat seals against a fixed, knife-edge orifice. The coated surface of the seat is susceptible to high pressure failure, while the system’s design creates additional turbulence as the moving air is redirected around the seat and through the orifice. The P.A.S.S. system utilizes a guided Piston type stem with a rounded edge which seals against a concave acetalic resin seat. Because the P.A.S.S. system forms a superior seal with less pressure, and because it is driven by a guided and aligned piston rather than floating on a lifting rod, the P.A.S.S. system can operate with lighter spring tension and less mechanical lag. This, combined with the venturi effect in the HSC, boosts both air delivery performance and response time.
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