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Home › Glossary › Dip Tube

Dip Tube

The dip tube is a plastic tube that carries incoming cold water to the bottom of a tank so it does not mix with the hot water at the top.

Technician inserting a dip tube into the cold inlet of a water heater

A broken or deteriorated dip tube lets cold water short-circuit to the outlet, which shows up as lukewarm water shortly after the tap opens. Plastic fragments in faucet aerators can also point to a failing dip tube.

See water heater not working for other symptoms.

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