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What is the use of laboratory thistle tube?

laboratory Thistle tube
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What is the use of laboratory thistle tube?

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This is a long tube with a bulb at one end, large enough to be able to pour liquids into. It is used to introduce liquids into a flask that is usually holding a solid so that the two can react together, especially if one of the products of the reaction is a gas (eg zinc and dilute hydrochloric acid to produce zinc chloride solution and hydrogen gas). As the thistle tube is long, after introducing the liquid the level of liquid in the flask rises above the end of the tube so that it acts as a seal, so any gas evolved can be channelled out of the flask through a sidearm tube to be collected, and not back up through the thistle tube.

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