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shell pump

noun
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Definition of shell pump

: a simple form of sand pump or sludger consisting of a hollow cylinder with a ball or clack valve at the bottom and used with a flush of water to remove detritus

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“Shell pump.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/shell%20pump. Accessed 6 Jul. 2020.

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