Sherwood Oasis Pro Scuba Diving Regulator This Item Includes: 1st, 2nd Stage Regulators, Low Pressure Hose, Owner's Manual Unprecedented breathing comfort, keeps mouth cool and comfortable for entire dive Moisture Retention Vanes captures exhaled moisture and returns it upon inhalation Nitrox compatible to 40% oxygen out-of-the-box 1st stage is a completely dry and environmentally sealed