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

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

1X 5 PCS One Way no return Check Valve