The listing, 10X Practical One Way Non-Return Check Valve Fish Tank Co2 Water Air Line Pump has ended.
Great one way check valve for aquarium air pump;
Protect you air pump by preventing aquarium water from back siphoning during a power outage;
Small and compact
It's easy to install
Compatible with standard aquarium air pipe of 3.5-4mm inner diameter
Shipping in 3-5 working days via Unregistered Airmail from Hong Kong, SO CAN'T TRACK ONLINE
Delivers in 4-7 business weeks.
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Thank you, Have a nice day!