The Calypso/Titan Octopus Second Stage Regulator is a Mid-Size, High Performance, Downstream Demand Valve Design The Second Stage is equipped with an Easy-to-Grip Venturi Knob that Stops unwanted Free-Flow when the Regulator is Out-of-your-Mouth The Second Stage comes with Aqua Lung's Standard Silicone Mouthpiece which is Comfortable to use A Grid built into the Exhaust Tee creates Finer-Exhaust Bubbles for Less-Noise and more Stability A new, Reinforced Polycarbonate material makes this Second Stage Stronger than its Predecessor The new Easy-Purge High-Visibility Yellow Front Cover with Side-Openings prevents Free-Flow when facing into Currents and provides Easy Identification when experiencing an Out-of-Air Emergency The Titan Regulator is equipped with a 3/8" Threaded Yellow 39" (99 1 cm) Low Pressure Hose and weighs 10 56 oz (299 37 g) Regulator is covered by a Limited Lifetime Warranty