All Mares diaphragm first stages are also balanced.
Thanks to a special design, the cylinder pressure (high pressure) acts around the valve stem and not in either direction of the movement. Due to the resulting pressure equilibrium on both sides of the direction of movement, the force needed for opening and closing the valve is not affected by the decreasing cylinder pressure.
This solution makes it possible to keep intermediate pressure the same regardless of the cylinder pressure. Thanks to the constant intermediate pressure and the option to have large valve apertures, Mares balanced regulators generally deliver higher air capacity and superior breathing comfort.
Nearly all the regulators in our Mares line use a diaphragm first stage. In diaphragm first stages the force needed to open the valve is transmitted by a diaphragm. The pressure difference causes the diaphragm to flex inward, which transmits this movement to the valve mechanism. A metal disc located below the diaphragm conveys the force to the valve through a pin.
The leading feature of diaphragm first stages is a more sensitive and precise management of air pressure supplied to the second stage, since the mechanical parts do not come in contact with the water. Isolating all moving parts from contact with the water also makes the diaphragm first stage ideal for diving in especially cold water.
All Mares regulators with diaphragm first stages are certified for use with an octopus in cold water (<4°C), as established by the recent update to standard EN250:2014. They can be identified by the EN250 A marking.
scubadiving first stage


PVD is the acronym for Physical Vapor Deposition, and indicates the technology used to deposit thin metal films over various types of substrates.
The process takes place in vacuum chambers in which the metals to be deposited are evaporated. Thanks to the kinetic energy they possess and the potential difference applied to the piece to be coated, the metallic ions are attracted to the surface of the objects, where they condense and form the desired coating.
This means that a physical process creates the finish, giving the item not only characteristics superior to any other chemical or electrochemical treatment, but it also guarantees a perfectly sustainable treatment with a low environmental impact that’s hypoallergenic and 100% food-safe.
The PVD coatings are particularly well-suited for innovative and advanced technical products that require superior performance in terms of resistance to abrasion, scratching, and corrosion.
A Pearl Chrome version is an elegant aesthetic combined with advanced abrasion and corrosion resistance! In this case, to achieve this special finish, it’s important to create a layer of nickel that evens out the metal surfaces as much as possible at the microscopic level. After an additional scrubbing, the item is immersed in the electrolytic chrome solution tank.
Then, using special oils, microbubbles are created that are evenly distributed over the surfaces of the piece to give them a pearly appearance.


Mares has dive gear to suit all your needs, whether they be recreational, tec, freediving and more...