Greluma 15 Pcs Aquarium Air Pump Check Valves Plastic One Way Non-Return Check Valve

• Package includes: 15pcs Air Pump Check Valves,necessary parts for your air pump aquarium O2 system.Please DO NOT use them with CO2 system.
• Function: Air-proof,one way no return safety valve,greatly protect you air pump by preventing aquarium water backflow during a power outage.
• Application: Compatible with standard aquarium air pipe of 4mm inner diameter,Perfect for aquarium,fish tank,fishing tackle shop,etc.
• Made of high quality plastic material,anti-aging,hard to break,sturdy and durable in use.Please use a paperclip to poke it from Input side to Output side when the outlet inside gets stuck.
• Air Hole Diameter: 0.15"/4mm;Overall Size:2.12"x0.55"/5.4x1.4cm(L*Max.D),Color: Red.

Specifications: Type: Air Pump Check Valves Overall Length: 54mm Material: Plastic Color: Red Quantity: 15pcs Function: When the oxygen pump is placed below the water level of the tank (such as on the bottom cabinet or table), when the oxygen pump stops working due to power failure or other reasons, it may cause the tank water to flow into the oxygen pump,to damage or burn out the oxygen pump, the check valve can solve this problem. Tips: 1. It may reduce the air delivery capacity a little because of resistance, but not much. 2. If you receive the check valve and find that there is no air outlet after connection, please check whether the installation sequence is correct. If it is correct, please disassemble the check valve and gently pinch the vent with your hand.