Basic entry level regulator popular in rental gear, so you may have already tried it. In-line high flow piston design 1st stage. 2nd stage has an easy-to-grip venturi knob to stop unwanted freeflow when the regulator is out of your mouth. Can easily be reversed from right-handed to left-handed configuration by an authorized Aqua Lung dealer without additional parts. Comes with Aqua Lung’s Comfo-bite mouthpiece which reduces jaw fatigue. Nitrox compatible up to 40% O2 when new, out of the box.