This wide mouth round bottle flask is made with a grounded flange that accepts an o-ring. This application is used for vacuum sealed systems. 

This distillation head is manufactured with 3 threaded necks, [2] GL-45 and [1] GL-32.

• [1] GL-45 can be used with item 1085-16, an adapter that allows a 34/45 joint to connect to the GL-45 opening.
• [1] GL-45 can be used as an opening used to insert more materials into the system
• [1] GL-32 can be used with item 1086-02, an adapter that allows a thermometer to be inserted to keep track of temperature.