The balance diaphragm first stage of the ATX range is pressure adjustable, and depth compensated. The dry seal first stage is ideal for cold, warm and contaminated waters without modification. The new smaller, lighter second stage retains the diver adjustable venture and cracking resistant controls. This second stage features a pneumatically balanced valve system thereby reducing the breathing effort and also has the benefit of an adjustable micro adjustment (requires special key) that allows each individual regulator to be precisely adjusted to give maximum optimum performance.