Features:
Specially designed non-return valves will protect your air pump by preventing aquarium water from back siphoning during a power outage
They are made of plastic material for long time use
Place these air pump check valves in your airline tubing between your air pump and aquarium water to prevent water returning down the air line
Specifications:
Fit airline tubing inner diameter: about 4mm
Dimension: 0.5”D x 2.1”L
Includes:
10pcs check valves