q654 [New] Check Valve, Backflow Preventer, Air Pump, Aeration

***Please Note***
? As this is an imported product, please refrain from purchasing if you are seeking perfection or if you intend to rate us poorly based on the condition of the packaging or the product itself.

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This is a set of 3 check valves (backflow preventers).
Operation has been confirmed.
Please be aware of [initial scratches, initial dirt, manufacturing burrs], etc.

When stopping the supply during aeration or CO2 addition, water from the aquarium can flow back through the tube, damaging equipment such as pumps and regulators, and causing unexpected accidents. By installing this backflow preventer, you can stop the backflow of water and prevent accidents.

Size: 53mm x 15mm
Compatible tube inner diameter: 4mm
Quantity: 3
Colors: Black, Clear
Material: Durable plastic

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Aquarium, Fish tank, Aquatic plants, Air tube, Air hose, Joint, Air pump