The AC25 is the third generation of Cressi's IP adjustable balanced piston first stage. It features two 7/16" UNF threaded high-pressure ports and five 3/8" UNF threaded low-pressure ports. 4 low-pressure ports are located on a rotating turret that ensures that regulator and instrument connections are always in the right position. The fifth port is a co-axial hi-flow port and is located at the top of the turret. The rotating turret swivels on 360-degree axis and features 5 low-pressure ports designed to allow the use of more connections without interfering between them. It features the external direct IP adjustment system that can be set using a simple hex key wrench. The hi-flow conic shape filter is the same for INT and DIN. The spring and the spring bushing are coated preventing rust. Its technologically advanced design delivers consistent intermediate pressure and high performance even with low tank pressures. The AC25m it features a matte finish, in gun metal-chrome plated brass.

AC25 first stage regulator is combined with the Master Cromo, the pneumatic balanced 2nd stage that features an elliptical shape and a lateral knob for Venturi adjustment. Adjustable inhalation effort on side of the regulator for fine tuning of breathing resistance. Patented elliptical diaphragm and low-friction lever provides air delivery system without injector. Adjuster knob is coated with PVD process with dual OR. Laser-etched titanium front cover piece, internal heat exchanger and for easy maintenance cover cap opening with cam-lock fastener. Second stage has a noise-absorbing techno polymer body and removable techno polymer exhaust deflector. 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.