stopcock

He is just as ignorant of a stopcock, and surely it would be difficult for him to understand the burning of the gas.
American Inventions and Inventors|William A. Mowry
A long india-rubber tube is attached to the bottom of the jar, ending in a metallic tube, and furnished with a stopcock.
The Physical Life of Woman:|Dr. George H Napheys
The patient seats herself on the edge of a chair over a basin, introduces the tube, and turns the stopcock.
The Physical Life of Woman:|Dr. George H Napheys
It is best to use this form with a glass stopcock, or with an india-rubber tube and clip, after the manner of a Mohr's burette.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer

The standard solution must be put in a burette with a glass stopcock, as it attacks india-rubber.
A Textbook of Assaying: For the Use of Those Connected with Mines.|Cornelius Beringer and John Jacob Beringer

British Dictionary definitions for stopcock

stopcock

/ (ˈstɒpˌkɒk) /

noun

a valve used to control or stop the flow of a fluid in a pipe

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

stopcock

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British Dictionary definitions for stopcock