From Wiktionary, the free dictionary
dip tube (plural dip tubes)
- A tube in a boiler that directs incoming cold water to the bottom of the tank, to be heated.
1999, R. Dodge Woodson, Plumber's Standard Handbook, pages 25–19:If the pilot light lights but continues to go out, replace the thermocoupling. If none of these methods prove fruitful, check the dip tube.
