Aquarium Check Valve, 10pcs One-Way Air Pump Non-Return Valve with Airline Tubing Standard Accessories for Fish Tank 5mm for Freshwater Saltwater Tanks, Aquariu

• Matters Need Attention---When the position of the air pump is lower than the water surface, prevent the backflow of water from damaging the front air pump or other equipment.
• 3 Different Sizes Are Available---This aquarium one-way non-return check valve has 3 different sizes for you to choose, that can meet your different needs.
• Working Principle---After adding the check valve, the air pump can be placed the water or below the water surface, and there will be no backflow of water when the air pump stops working.
• Wide Range of Application---This aquarium one-way non-return check valve is a wonderful accessory for aquarium air pump, whcih can be suitable for most aquarium air pump.
• Qualitative Materials---This aquarium one-way non-return check valve is made of high quality plastic material, which is beautiful and .

Specification: Condition: Brand NewItem Type: Non-Return Check ValveMaterial: plasticColor: As picture shownOptional Size: 3mm, 5mm, 7mm3mm: The interface diameter is 3mm/0.1in 5mm: The interface diameter is 5mm/0.2in 7mm: The interface diameter is 7mm/0.3in Suitable for: Aquarium air pump Function: Used as an oxygenation pump due to the water current reversed due to the pressure difference between the inside and outside when it suddenly stops working, damages the oxygenation pump and causes the water in the tank to overflow to form property damage, prevents the water in the fish tank from flowing back into the air pump, and burns the air pump to avoid danger. Indispensable accessories for air pumps. Package List: 10 x Non-Return Check Valve