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Thumbnail Filmstrip of AQUATOP HJS-3081BK Check Valve/Air Filter Images
Check valves protect air pumps from aquarium water back-siphoning damage during power failures. To use, cut airline tubing between air pump outlet and aquarium. Attach airline to each end of valve. Narrow end should face the aquarium. Valve measures 2 inches long.
FEATURES:
- Protect air pumps from aquarium water back-siphoning damage during power failures
- Attach airline to each end of valve (pointed end of internal flap away from pump direction)
- Valve measures 2 inches long
- Easy to use
- Durable and long lasting
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