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Mares Fusion 52X scuba regulator sets the benchmark in high-performance regulators, now more durable and comfortable than ever before. For the first time, a Mares regulator is equipped with flow control, to deliver gas at a natural breathing rate, or to give you a more powerful breath when you need it. This dive regulator is 600% more durable, even under the most extreme conditions. The bypass of the Fusion 52X features a 77% increase in the flow cross section and double curvature to provide a smoother flow while optimizing performance.