5 PCS Circulate Black Red Plastic Air Pump One Way Non-Return Co2 System 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. Compatible with standard aquarium air pipe of 4mm inner diameter The necessary parts for your air pump aquarium O2 system 100% Brand new and high quality Great one way check valve for aquarium air pump Material: Plastic Size: As The Shown Small and easy to install Price difference quality is huge different for this item quality Made of durable plastic

1X 5 PCS One Way no return Check Valve