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Here are Similar First & Second Stages:
Review Summary
Yes, Mixtures Containing Helium (He) & Maximum O2 Content of 40%
Upstream Servo-Valve Design
Housing PVC, Internal Mechanism Brass, Stainless Steel and Rubber
The Poseidon 2nd Stage Xstream 9/16 Deep Nitrox Regulator uses an upstream servo-valve design with a safety valve opening pressure of 261 +/- 14 psi (18 +/- 1 bar) relief pressure. The second stage has a durable PVC housing with metal mechanism and rubber parts. The regulator has an automatic Venturi assist and inhalation control. The Xstream Deep: rated for use down to 656' (200 meters) and for use with mixtures containing helium (He) and a maximum O2 content of 40%. Color coded Black to avoid confusion with other gas mixes.
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