Lightweight and reliability is what the Mares Rover 15X Regulator provides for the diver, with the regulator weighing only 35.45 oz. (1,107 g) with the hose. Reliability does not mean lack of high performance with the combination of the Mares 15X 1’st-stage and the Rover 2’nd stage. The sandblasted chrome plated marine brass first stage regulator is a balanced diaphragm design which is inherently environmentally sealed. The diaphragm membrane transmits the pressure changes to the internal mechanism eliminating the need for the surrounding water to enter the intricate mechanism. The benefit of this type of first stage design is that none of the internal parts are exposed to contaminants such as salt, sand, chlorine, or pool acids. These environmental contaminants cause corrosion and mineral deposits to form on the internal mechanism deteriorating regulator performance. The Instinct 15X uses A.C.T. Advanced Coating Technology. This patented technology created to optimize performance, safety, and reliability. The valve is covered with a hard Polyurethane (PU) and the sealing surface is a layered with a soft PU for a perfect seal. Tri-material (brass, soft PU, and “heavy-duty” PU) reaches new levels of durability. The new valve is 600% more durable than its predecessor.