Aquarium Air Pump, 10 Pieces, One-Way Check Valve, Aquarium Water Stop Accessory (3mm)

Features:1.Made of plastic, beautiful and durable.
2.When the air pump is positioned lower than the water surface, it prevents water backflow from damaging the air pump or other equipment.After adding the check valve, the air pump can be placed above or below the water surface, and there will be no water backflow when the air pump stops working.
3.Prevents aquarium water from flowing back into the air pump and burning it out, thus avoiding any danger.
4.A wonderful accessory for aquarium air pumps.
5.3 different sizes to choose from, meet your various needs.
Specifications:Condition: 100% Brand New
Item Type: Check Valve
Material: Plastic
Color: As the picture shown
Optional Size: 3mm, 5mm, 7mm
3mm: Interface diameter is 3mm/0.1 inch
5mm: Interface diameter is 5mm/0.2 inch
7mm: Interface diameter is 7mm/0.3 inch
Suitable for: Aquarium air pump
Function: Used as an oxygenation pump. Due to the reverse water flow caused by the pressure difference between the inside and outside, when it suddenly stops working, it damages the oxygenation pump and causes water to overflow into the tank, potentially leading to damage. Materials, prevents water in the aquarium from flowing back into the air pump and burns out the air pump to avoid any danger.Essential accessories for air pumps. Package list: 10 x check valves