Einhell Filter Pressure Regulator R3/8. The original Einhell filter pressure regulator R 3/8 inch is designed to provide clean, dry, and regulated compressed air. It improves the quality of the compressed air by removing solid particles and condensed moisture. The control valve allows for precise regulation of the airflow while reducing the tank pressure to operating pressure. The filter pressure regulator is equipped with a control knob, pressure gauge, quick coupling, sight glass, and drain screw. The inlet pressure is a maximum of 10 bar, with an adjustable pressure range of up to 8 bar. The filter element for capturing oil and water particles in the compressed air is replaceable. Connection: R 3/8.