Cressi AC25m / Master Cromo RegulatorAC25m Master Cromo Regulator The AC25 is the third generation of Cressis IP adjustable balanced piston first stage. It features 2 high pressure ports and 5 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 axis and features