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

Label:Yes Protect you air pump by preventing aquarium water from back siphoning during a power outage. Small and easy to install Great one way check valve for aquarium air pump Compatible with standard aquarium air pipe of 4mm inner diameter Made of durable plastic Size: As The Shown Material: Plastic Color: Black Transparent;Red Transparent Price difference quality is huge different for this item quality The necessary parts for your air pump aquarium O2 system 100% Brand new and high quality 1X 5 PCS One Way no return Check Valve