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Sherwood incorporates its dry bleed technology that keeps the water out of the spring chamber. As the diver dives deeper, the water pressure increases. In traditional regulators this increased pressure is conveyed into the spring chamber by water. This water will eventually cause corrosion and wear on the internal spring. By using the dry bleed system, the increased water pressure results in an increase air pressure as the bleed system forces a tiny bit of air out a one way valve. The spring chamber stays dry and corrosion is reduced. Bottom line, this system works great. Over the period of an hour dive, the dry bleed system will equal about three or four breaths of expended air through the one way valve.