VAYINATO (Blue) One Way Plastic Non Return Check Valves (Pack of 5) for Aquarium Air Pump Aquarium Tool
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Suitable for the air pipes whose diameter is under 4mm.The one way valves can protect you air pump by preventing aquarium siphon during a power outage and water box back damage.After the check valves being added, the air pump can be placed above the water surface or below the water surface. It is more convenient.The no-return valves can prevent water from entering into air pump. It is an indispensable part of air pump.
