How to install: 1. Clean and dry both sides of the pipe before use to fix the valve firmly. 2. Check the flow direction of the valve to make sure it is installed on the right side. 3. Carefully connect the air pump return valve to the hose and connect it completely. Tip: If the valve restricts airflow in both directions, insert something into the bore on the inlet side to push the valve. The valve will then allow air to escape. flow in the right direction. 10pcs Aquarium Tank Air Pump Valve
