100mL Tube, Reaction, 24/40 Outer Joint, 2mm Glass Stpk, Airfree, Schlenk. Cylindrical shaped tube useful for storage or simple reactions. Tube has a standard taper outer joint. Available with a choice of a 2mm high vacuum glass stopcock having a Stainless Steel constant pressure retaining device or a 0-4mm Chem-Cap Airfree inlet valve.