Definition of sight glass in English:

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sight glass

noun

A transparent tube or window through which the level of liquid in a reservoir or supply line can be checked visually.
Example sentences
  • The fuel bowls also feature a clear sight glass for fuel level verification and adjustment.
  • On some equipment, a visual sight glass or gauge shows fluid levels without opening the system, while on others a dipstick or other manual measuring device is used.
  • Babette pointed a red fingernail to the sight glass of the brass lubricator.

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