The XS Compact AC2 Regulator is an exceptionally dependable non-balanced Flow-by-Piston designed 1'st stage Regulator that is a great choice as a new divers rig, or for use as a stage bottle regulator system. The 1'st stage has 1 HP port and 4 LP ports, and is made from Marine Grade Chromed Brass for long life and durability. A conical filter is used which has greater surface area for higher air flow characteristics through the 1'st stage regulator. The XS Compact Second-Stage housing is made of durable non-corrosive hi-tech polymers, and has a dependable downstream demand valve mechanism. The flow of air is channeled to the mouthpiece by injection, creating a venturi effect enhancing the performance. The 2nd stage comes with a flow deviator that acts on the Venturi effect, with dive/pre-dive adjustment function. Large soft purge cover allows easy clearing of 2'nd stage and a comfortable silicone mouthpiece. The XS Compact AC2 Regulator comes with an Owner's Manual and a limited lifetime warranty.