Environmental Dry SealAn Environmental Dry Seal insulates the spring and diaphragm from the environment has several advantages ? it reduces corrosion of the internal mechanism and because it is highly resistant to freezing is important in cold-water diving.
In order to keep a consistent flow of air at depth your regulator needs to sense changes in depth. This is achieved in most regulators by allowing the regulator spring chamber to flood with water. Diaphragm style regulators achieve this through limited ingress of water, typical piston designs flood completely. Unfortunately when water completely floods through your regulator it carries with it damaging contaminants that will reduce the regulator's performance and life-span. Many attempts have been made to seal regulators; one system packed the regulator with oil, while another of bubbles to keep the water out.
The most effective system is the patented Dry Sealed System, which is available as an option on Aqua Lung regulators and standard on most models of Apeks regulators and high end Aqua Lung models.
The Environmental Dry Seal:
protects main spring from freeze up
keeps spring chamber free from contamination and corrosion
