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

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

1X 5 PCS One Way no return Check Valve