Thistle Funnel with Rotaflow Stopcock

The Thistle Funnel with Rotaflow Stopcock is an advanced piece of laboratory glassware designed for precise addition and controlled dispensing of liquids. It features the standard thistle funnel structure—a long glass stem with a bulbous top reservoir for holding small volumes of reagent—but includes an integrated Rotaflow stopcock valve along its stem.

Made from borosilicate 3.3 glass, the thistle funnel is chemically resistant, heat-resistant, and durable, ensuring long-lasting laboratory utility. The Rotaflow stopcock is a rotary valve mechanism, allowing the user to finely control the flow or shut it off completely by simply turning the handle. This feature is especially useful in chemical experiments where exact liquid addition is needed—such as titrations, controlled reagent additions, and producing dropwise flows into a reaction flask.

The funnel’s combination of a precise thistle tube with a Rotaflow stopcock facilitates safe, easy dosing and minimizes risk of spills or uncontrolled reactions. This glassware meets international standards and is recommended for analytical chemistry, research, and academic labs requiring accuracy and safety in liquid handling.