5 PCS Durable Plastic Fish Tank Co2 System One Way Non-Return Air Pump Aquarium Check Valve

Label:Yes Color: Black Transparent;Red Transparent Protect you air pump by preventing aquarium water from back siphoning during a power outage. Made of durable plastic Small and easy to install Material: Plastic Price difference quality is huge different for this item quality Size: As The Shown 100% Brand new and high quality The necessary parts for your air pump aquarium O2 system Great one way check valve for aquarium air pump Compatible with standard aquarium air pipe of 4mm inner diameter

1X 5 PCS One Way no return Check Valve