5 PCS Durable Plastic Fish Tank Aquarium Check Valve Co2 System Air Pump One Way Non-Return

Label:Yes 100% Brand new and high quality 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 Compatible with standard aquarium air pipe of 4mm inner diameter Made of durable plastic Size: As The Shown Great one way check valve for aquarium air pump Price difference quality is huge different for this item quality Material: Plastic Small and easy to install 1X 5 PCS One Way no return Check Valve