Product description Pack of 10 red one-way air valves are manufactured in made of durable plastic materials and designed to adapt to any environment. most gasoline pumps; common aquarium air without making noise. Prevent your pump from running water through your pump during water changes or when the power goes out. Note: Do not fit air valves to CO2 system as high pressure will cause them to crack and leak. Fit standard 4mm hoses Good, unrestricted airflow Rigid plastic Durable and strong to aging Long working time without noise How to install 1. Before use, please clean and dry both sides of the tube to hang the valve well. 2. Check the flow direction of the valve to make sure it is set on the correct side. 3. Carefully connect the pump check valve to the pump. air to the tube and connect it completely. Tips: If the valve restricts airflow in both directions, insert something into the side hole. input to push the valve. After that, the valve would allow the air to flow in the right
