Non-Return Valve Glass for Aquarium Air Pump Black color
Non-Return Valve Plastic for Aquarium Air Pump Blue color
Suitable for the 4*6mm diameter tubes.
Place in the air tubing between your air pump and aquarium water.
The end marked with “Arrow” is the outlet.
Check valve only, other items are not included.
Whole Length: 50mm.
1. To prevent water backflow to damaging the front end of the pump or other products and equipment.
2. After the addition of the stop valve, the pump can be placed above or below the surface of the water to prevent the risk of water backflow when the pump is shut off.
1. Used for oxygen pump to prevent water backflow to damage oxygen pump.
2. To prevent the water inside the tank from back into the pump to burn the air pump.
3. To avoid danger, it is an essential accessory for the air pump.
Each outlet needs to connect a stop valve, a two-headed pump needs two stop valves, and so on.
1. Material: Glass
2. Color: Glass + Black