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Vinony

water jacket

noun

  1. casing containing water circulated by a pump
L1410293 on Wikidata ↗

Wiktionary

noun

  1. An enclosed space, or the walls used to create it, that surrounds an object to be heated or cooled by water flowing around it.

    “The headbolt heater consists of a hollow steel bolt containing an electric heating element. This device is designed to heat the water jacket and is applied to the engine head by replacing a headbolt.”