20 PCS Fish Tank Oxygen Pump Trachea Check Valve, Specification: 4mm (Black)
Description
1. Material: ABS2. Safety lock to prevent backflow3. The aerator pump can be placed in any position, pay attention to the direction of the air outlet when installing4. Air out directly from one end, if it can be blown through, that is, this end is the air inlet and the other end is the air outlet5. Safe and durable, safe to use6. Dimensions: 4mm total length 5.5 cm, 4mm blue total length 4.3 cm, 8mm total length 5.5 cm, 10mm total length 4.5 cm, 12mm total length 3.8 cm, 4mm white red/white black total length 4.2 cm7. Weight: about 8 grams
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