AC25g first stage regulator is combined with the Compact, the downstream 2nd stage popular for its compact design and lightness. The 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. Regulator meets EN250/2014 certification for use in water temperature colder than 50-degrees F (10-degrees C). Regulator comes with a 3/8″ threaded 30″ (76.2cm)low-pressure hose, an owner’s manual and is made in Italy.