This demonstration video goes over the features of the Hollis DC1 212 Balanced Regulator. The DC1 212 Regulator comes with an over-balanced first stage achieves superior performance by increasing your air flow the deeper you go and a pneumatically balanced second stage. The DC1 212 Regulator features an environmentally sealed first stage provides greater reliability, less maintenance and higher performance. There is a "diver adjustable" air flow and a "diver adjustable" venturi to prevent unwanted free-flow. There are easy grip controls even while wearing gloves.