Hollis 221 DC3 Regulator
Hollis 221 Second Stage
- Pneumatically balanced second stage
- Ergonomic A.V.S. (Adjustable Venturi System) Dive/Pre-Dive Switch
- Patented Orthodontic Mouthpiece with High Density Bite Tabs
- High performance over-balanced first stage provides progressively greater intermediate pressure as depth and gas density increases for superior gas delivery under the most extreme conditions
- Designed to withstand the rigorous CE standard for coldwater performance
- Environmental sealing prevents internal corrosion, contaminants, and icing of the first stage
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