Hole outer diameter: 4mm
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SODIAL(R) Acrylic Aquarium Non-Return Air Pump Check Valve
Protect you air pump by preventing aquarium water from back siphoning during a power outage.Place in your airline tubing between your air pump and aquarium water to prevent water returning down the air line.
20* Stop Valve
Only the above package content, other products are not included.
Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.
SODIAL Acrylic Aquarium Non-Return Air Pump Check Valve - B07DFHRWJT