Aquarium Check Valve, One Way Non Return Valve For Aquarium Air Pump, Red, 10Pcs

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