Product Description Pack of 10 Red One-Way Air Valves Made from durable plastic to suit any environment. most gas pumps; normal aquarium air without noise. Prevent your pump from running out of air to run water through your pump during water changes or in the event of a power outage. Note: Please do not place the air valves in the CO2 system, as the high pressure will cause them to rupture and leak. Fits standard 4mm tubing Good airflow and no restrictions Plastic hard rigid Durable and anti-aging Long service life without noise Installation 1. Before use, clean and dry both sides of the tubing to hang the valve well. 2. Check the flow direction of the valve to make sure it is placed on the correct side. 3. Carefully install the pump check valve on the pump. Air into the hose and fully connect it. Tips: If the valve restricts airflow in both directions, please put something in the hole on the side. Input to push the valve. After that the valve would allow the air to flow in the right
