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

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

1X 5 PCS One Way no return Check Valve