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

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

1X 5 PCS One Way no return Check Valve