The Aquatec RG-1100F is a piston based 1st stage, featuring the Extended Thermal Insulating System that gives this 1st stage a 30% improvement of freezing over previous models.  It has an ultra fast breathing response and great sensitivity with extra-high airflow.

The 1st stage features two high-pressure ports, and five low-pressure ports; with an intermediate pressure of 9.5~10.2 BAR.  CE Approved and manufactured from chrome plated brass with stainless steel springs for long life.