Microscale, single-neck, round-bottom reaction flask

The top joint is a combination cap, thread and [ST] joint to accommodate and seal other microscale apparatus. Has an externally threaded side port to facilitate retrieval or injections. The O.D. of the top joint has an external thread to facilitate an o-ring and open-top phenolic cap. The internal or I.D. at the top is a ground outer joint. This type of connection eliminates the need for clamps while offering the positive leak-tight seal of ground glass. Fabricated from borosilicate glass.