Place in your airline tubing between your air pump and aquarium water to prevent water returning down the airline Be attention: Please DO NOT use them with cO2 system Made of durable clear plastic Package Weight: 38g134oz

For Oxygen Pumps Only: great 1-way check valve for most common aquarium air pumps NOT suitable for cO2 or other high-pressure systems to avoid crack and leak Small & Light: Size: 21 L x 055 W Diameter of air holes: 012 Weight: 01 oz Standard ID airline tubing: 316 Add little weight to your hose for smooth airflow Ideal Pump Protectors: Prevent backflow of water through the tubing during a power outage or pump pause Essential accessories for basic aeration setup in your fish tanks Sturdy & Quiet: Made of reliable plastic which can be tightly connected to the hose without air leak Durable to endure long-time use without making noise Easy Maintenance: clean the valve regularly Please poke it with a slim stick from the inlet side to push it open when it gets clogged inside and restricts air flow