Air Pump Check Valve One Way Valve Non-Return Valve Reusable Plastic Air Control Valve Aquarium Accessories for Fish Tank 2 Pieces Useful and Nice

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They are made of plastic material for long time use.

Hole Diameter: 4 mm; Total Size: 5.3 x 1.5 cm (L * Max. W);

The aquarium valves are important accessories for air pumps.