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

Label:Yes Compatible with standard aquarium air pipe of 4mm inner diameter Great one way check valve for aquarium air pump 100% Brand new and high quality Color: Black Transparent;Red Transparent 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. Material: Plastic Made of durable plastic Size: As The Shown The necessary parts for your air pump aquarium O2 system Small and easy to install

1X 5 PCS One Way no return Check Valve