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Hollis Dc1 Din. DC1 1st Stage - 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.- Swivel turret allows for ideal low pressure hose routing. - Environmental sealing prevents internal corrosion, contaminants, and icing of the first stage.- Designed to withstand the rigorous CE standard for coldwater performance. - DIN System.