Accurate check valves can prevent back flow of water. These check valves are helpful when there is a power outage which water can reach back into the air pump. Great check valves for aquarium air pump.
- Protect air pump from back-siphoning damage
- Prevent flooding during power failures
- Fit 4mm air hose or tubing
- Overall Length: Approx. 2 inch
- Material: Plastic
- Color: Black and transparent
- 100 x Check Valve