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

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

1X 5 PCS One Way no return Check Valve