In-line filter & regulator 1/2 BSP In-line water traps/filters are necessary to separate water and oil from the airflow during the air compression process. A regulator is combined with the filter to increase or decrease the pressure. A pressure gauge indicates the set pressure. Visible arrows are on the outer body of the casing that indicate the direction of installation to correspond with the direction of airflow. Drain: Manual A push-in fitting is located on the drain to allow fluid to drain to a central point via PU tubing (not included).
