gravity feed

noun
1.
the supplying of fuel, materials, etc., by force of gravity.
2.
a system or device designed for this purpose.

Origin:
1910–15

gravity-fed [grav-i-tee-fed] , adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
The shelter will have wood-heated steam baths, a gravity-fed sewer system and a
  permafrost-chilled cellar.
Gravity-fed eye wash stations contain their own water or flush fluid, and must
  be refilled after every use.
The treated water is stored in three storage tanks and is gravity-fed to houses
  and businesses when needed.
Collected rainwater joins river water and is diverted through a series of
  gravity-fed irrigation ditches.
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