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

Label:Yes Size: As The Shown Price difference quality is huge different for this item quality Small and easy to install Made of durable plastic 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. Color: Black Transparent;Red Transparent The necessary parts for your air pump aquarium O2 system 100% Brand new and high quality Material: Plastic Great one way check valve for aquarium air pump 1X 5 PCS One Way no return Check Valve