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Like most regulators, it is compatible with enriched air nitrox EAN up to 40 percent. This is for two reasons. The Core Supreme is a decent-looking regulator that delivers a smooth breathe, doesnt break the scales when it comes to weight, and at this price point, represents excellent value for money. Aqua Lung Leg3nd is the third generation Legend octopus and is a top-quality secondary regulator. The D420 is reminiscent of previous D-regs, with its unusual shape of second stage. This gauge connects to a high-pressure port on the primary regulator. Did early Aqualung Legends have fixed (built-in) crowns in the first stage? If cost is not a factor the T3 is the best regulator on the market. The octopus is threaded onto a low-pressure port on the primary regulator. It is equipped with a factory sealed first stage, huge purge button, comfort swivel, and no less than seven low-pressure ports and two high-pressure ports. The scuba octopus is a backup of the second stage regulator. So, it cant hurt to be over-prepared. The cracking resistance control and venturi lever make a real difference to the breathe, which is smooth in all orientations. It also typically has two Venturi settings for pro-dive and driving conditions. CRACKING RESISTANCE:Yes |VENTURI:No|VERDICT:The Z3 may be the affordable entry-level model into the world of Atomic Aquatics, but it has a lot in common with its more-expensive siblings. In addition to these checks, the tank condition and valve conditions should be checked before each use. Aqua Lung has been making diving equipment for more than 75 years, and their regulators have always been solid units, but they have really come on in recent years the Core Supreme is a belting little unit for this price point. The Dual Adj is made from an ultralight technopolymer, which is abrasion resistant but extremely lightweight, making it ideal for cold-water use, but also for travel. It is an environmentally sealed overbalanced diaphragm design, with a heat exchanger wrapped around the HP valve, so perfect for cold-water diving. This test model came with an SPX piston first stage, with two high-pressure ports and four low-pressure ports, which are angled for optimum hose routing. Despite the SPX first stage not being environmentally protected, it didnt falter in the cold even with robust testing. Its rated for extreme cold and can be used safely for demanding immersions like ice diving. Yoke valves are more common but only work with tanks filled to less than 3000 PSI. Aqualung Leg3nd MBS - good or bad? vs Elite? | ScubaBoard CRACKING RESISTANCE:No |VENTURI:Yes |VERDICT:The Hollis DC7 / 150LX is a great package - the compact first stage has excellent cold-water performance but is still quite lightweight, and the second stage has a large purge and venturi lever, and a comfortable mouthpiece. The DIN valve is different in that the sealing o-ring is mounted into the first stage itself, not the tank valve. The second stage is pneumatically balanced to maintain breathing effort at different depths and tank pressures. How often should I check my scuba cylinder. This third-generation model is no different. The 200LX features a braided hose, large venturi lever, chunky cracking resistance control, and has a big purge. This can waste a lot of air and cause stress on the surface. The rest of the world is dominated by DIN tanks and regulators. Having said all this a new Mk25/G260 would probably be your upgrade although I don't think there is anything wrong with what you have. Regular with a longer then normal service interval? The second stage always has a purge valve to blow air in the event the regulator needs to be placed back into a divers mouth underwater. So Debra Sue, what type of diving do you intend to do?