With outer joints - side necks are 20° to center neck.

With outer joints

With outer joints - side necks are 20° to center neck

With outer joints - side necks are vertical.

With a third neck having a 10/30 outer joint for thermometer, bleed tube, or gas inlet.

With a third neck having a #7 internal thread. Supplied complete with nylon bushing and o-ring.

With outer joints

With outer joints

With outer joints. Entire body of flask is jacketed.