gage glass

gage glass

[′gāj ‚glas]
(engineering)
A glass, plastic, or metal tube, usually equipped with shutoff valves, that is connected by a suitable fitting to a tank or vessel, for the measurement of liquid level.
References in periodicals archive ?
The system utilizes the company's Electro Eye-Hye System (Remote Drum Level Indicator) with a water gage glass attached for local (direct) viewing of the drum level.