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

Label:Yes Protect you air pump by preventing aquarium water from back siphoning during a power outage. Material: Plastic Price difference quality is huge different for this item quality Made of durable plastic Color: Black Transparent;Red Transparent The necessary parts for your air pump aquarium O2 system Small and easy to install Great one way check valve for aquarium air pump 100% Brand new and high quality Size: As The Shown Compatible with standard aquarium air pipe of 4mm inner diameter

1X 5 PCS One Way no return Check Valve