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

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

1X 5 PCS One Way no return Check Valve