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

Label:Yes Size: As The Shown Great one way check valve for aquarium air pump 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. Price difference quality is huge different for this item quality Color: Black Transparent;Red Transparent 100% Brand new and high quality Material: Plastic Small and easy to install Made of durable plastic The necessary parts for your air pump aquarium O2 system

1X 5 PCS One Way no return Check Valve