The top of the main vapor tube is open, with an additional vapor tube to decrease the risk of pressure buildup

·         The upper sampling port has a 4 mm stopcock with a Standard Taper 14/20 outer joint for the head

·         A double-oblique stopcock with a Standard Taper 14/20 inner joint allows removal of distilled solvent or return to flask

·         Manufactured from 33 expansion, low extractable borosilicate glass conforming to USP Type I and ASTM E438, Type I, Class A requirements