The Tetra Tec Non-return-valve CV4 protects sensitive units like air pumps for water coming from the aquarium. If your air pump is located under the water level, water from the aquarium can be rinse out by a defect of the air pump or power failure. So the whole aaurium can be rinse out.
- Hrvoje V. wrote about Tetra Tec CV4 Non-return valve in 2016:
Great product. It's a must have and price is one of the best online. Buy it
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