Palantic AS101 DIN Diving Dive Regulator and Octopus Combo High quality regulator first stage and second stage with 36" yellow hose on the octopus and black hose on the 2nd stage regulator 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 Non-adjustable second stage Environmental sealing prevents internal corrosion, contaminants, and icing of the first stage Large purge button. Unbalanced Flow-by Piston Regulator