The Hollis 212 Second Stage Regulator is a Pneumatically Balanced Demand Valve Design with a Patented Dynamic Adjustment that once set Automatically Maintains Inhalation Effort throughout the Dive by Compensating for Depth Changes.
The Hollis 212 Second Stages also has an Adjustable Venturi System. This simple Dive/Pre-Dive Switch allows the diver to Adjust Inhalation Effort so the Second Stage won't Free-Flow during shore entries or long surface swims.
All Controls are Easy Grip Controls for Precise Adjustments even while Wearing Gloves. The Hollis 212 Second Stage Housing is manufactured from Durable ABS/Polycarbonate.