A Schlenk flask, or Schlenk tube, is a reaction vessel typically used in air-sensitive chemistry, invented by Wilhelm Schlenk. It has a side arm fitted with a PTFE or ground glass stopcock, which allows the vessel to be evacuated or filled with gases. These flasks are often connected to Schlenk lines, which allow both operations to be done easily.
Three Schlenk flasks with 500, 250 and 100 mL volume on cork rings.
A pear-shaped Schlenk flask. The flask's sidearm contains a greased stopcock valve, and the flask is capped with a Suba•Seal septum that has not been turned down.
A heavy walled, tube shaped, Schlenk bomb fitted with a large bore plug valve designed for high temperature closed system reactions.
A Straus flask often called a solvent bomb. "Solvent bomb" is any Schlenk bomb dedicated to storing solvent. It is the construction of the flask neck which makes a Straus flask unique.
A stopcock is a form of valve used to control the flow of a liquid or gas. The term is not precise and is applied to many different types of valve. The only consistent attribute is that the valve is designed to completely stop the flow when closed fully.
A single hole hollow glass stopcock held in place by vacuum
A straight bore plastic stopcock without the female joint. Note its washer and nut system for attaching to its female joint.
A T-bore glass stopcock in a three way assembly. Two of the outlets end in plain hose adapters while the third ends in a male 14/20 ground glass joint. This stopcock is attached with an easily removed metal spring.
A double oblique bore glass three-way stopcock
