Manufactured from 3.3 expansion borosilicate glass complying with ISO 3585 (ASTM E-438 Type 1 Class A), Items marked with * complies with DIN 12594, Designed to fit the angled condenser in vacuum distillation applications, Delivery stem within cone, Supplied with detachable plastic screw thread connectors which allow 9mm bore flexible tubing to be fitted easily and safely