free piston

noun

: a combination of two pistons that are usually of different diameters, are rigidly attached to the same piston rod, work in different cylinders without external connection, and are used in some pumps and pressure gauges

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“Free piston.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/free%20piston. Accessed 23 Nov. 2024.

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