AR2000-02 Air Pressure Regulator Air inlet size:1/4 NPTFlow:550L/minutesMax working pressure:150PSIOperating temperature range:32-140°FBody material: Aluminum Alloy Accessories: A pair of Metal Air Coupler & Plug Kit2 x 1/4" NPT Fittings1x Thread Seal Tape Installation and Operating Preparation All calibrated components shall meet the maximum flow requirements. To prevent dust from entering the gas path, please clean the port and fitting first. Note that the port and thread sizes are consistent, and that the airflow direction follows the same path as indicated by the arrow. Pressure Adjustment Pull up the pressure gauge knob， If you turn clockwise, the pressure will rise steadily otherwise it will fall. Stop turning and lock the knob downward when the desired index is reached, forget this step you may face leakage problem. Dial to read Please ensure that the pressure gauge is tightly installed on the main body, and pay attention to whether the reading rises or falls smoothly while adjusting pressure.