TAIKUU 久の物 20 PCS Aquarium Air Pump Check Valves One Way Plastic Non-Return Check Valves for Fish Tank Aquatic Accessories Supplies, White 4mm

Description

【Material】Made of durable clear plastic, the check valve is non-toxic and tasteless, no harm to fish.
【Application】The check valves are for common aquarium air pumps, NOT for CO₂ system.
【Size】Length:2.16″/5.5cm, diameter: 0.16/4mm, suitable for air pipe of 4mm.
【Warm Tips】When you find that the air is blocked, please use a needle to poke from the input side to the output side.