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

Label:Yes Great one way check valve for aquarium air pump Small and easy to install Material: Plastic Color: Black Transparent;Red Transparent Protect you air pump by preventing aquarium water from back siphoning during a power outage. Compatible with standard aquarium air pipe of 4mm inner diameter Made of durable plastic 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 Size: As The Shown

1X 5 PCS One Way no return Check Valve