Xs2/ac2 is the most inexpensive regulator in the cressi range. The xs2 2nd stage comes with the traditional cressi ac2 piston 1st stage. Constantly reviewed over the years, this regulator has lots of admirers in the world due to the fact that it is extremely simple and strong, features that make it easy to use and result in low-cost maintenance. 2nd stage xs2: the body of the 2nd stage is traditionally sized, made from hi-tech polymers and with a lateral valve downstream system with adjustable orifice, simple and extremely reliable. A flow of pilot air is channelled to the mouthpiece by injection, enhancing the performance. The 2nd stage comes with a a flow deviator that acts on the venturi effect, with dive/pre-dive function. In any case, performance levels are high, and it is suitable for any kind of dive.