Chemglass AF-0537-04 250 mL single-neck Airfree Schlenk reaction tube with 24/40 standard taper outer joint and 2 mm high-vacuum glass stopcock with stainless steel constant-pressure retaining device for air-sensitive storage, small reactions, inert-atmosphere transfers, Schlenk-line chemistry, organometallic synthesis, catalyst handling, solvent degassing, vacuum/inert gas cycling, sample storage, and general synthetic chemistry glassware setups. This cylindrical borosilicate reaction tube is designed for simple reactions or storage under controlled atmosphere and interfaces with standard 24/40 lab glassware, adapters, condensers, stoppers, and Keck clips. Manufacturer part AF-0537-04; buyer should confirm stopcock plug, spring/retainer, joint condition, and vacuum suitability from photos.
