This is the Cressi AC2 Compact 1st and 2nd Stage RegulatorFeatures: Technical features 1st stage Unbalanced piston 1 outlets hp 7/16 unf 4 outlets mp 3/8 unf Service pressure: 232 bar (3365 psi) yoke version Calibration pressure: 9,5-10 bar Brass body electroless nickel-plated High capacity conical filter electroless nickel-plated Aisi 316 long lasting piston Easy external direct ip adjustment system Stainless steel spring Flow rate: 2100 l/min Yoke version weight: 635 gr Technical features 2nd stage Downstream system Adjustable venturi effect Patented antifriction lever Big purge button Anti-scratch surface Bayonet-type cap holder with security lock Removable exhaust tee without tools Weight without hose: 135 gr Jacketed hose extremely light and flexible weight: 153 gr Certification en250/2014 a>10Adeg c Set (int) + hose tot. weight 923 gr Empower your diving experience with the Cressi AC2 Compact 1st and 2nd Stage Regulator. Its strengths lie in its extreme lightness, excellent performance, very easy maintenance, and affordable purchase price. Features include a 1st stage with an unbalanced piston, adjustable pressure, and high flow rate. The 2nd stage has a patented antifriction lever, a big purge button, and an anti-scratch surface. Weighing in at just 923 grams (int) with the included hose, this regulator is perfect for both beginners and experts alike. Certified for use in temperatures above 10AdegC, it&';s a must-have for any dive.