(10) Conical flange with flat ground bottom to allow the head to sit flatly on a reaction kettle or flask. Fourth joint is a 10/30 outer joint to permit a thermometer to be inserted vertically to the bottom of the vessel.
(10) Conical flange with flat ground bottom to allow the head to sit flatly on a reaction kettle or flask. Fourth port is a #7 internal thread with nylon bushing to permit a thermometer to be inserted vertically to the bottom of the vessel.
(10) Flat flange with flat ground bottom to allow the head to sit flatly on a reaction kettle or flask. Fourth joint is a 10/30 outer joint to permit a thermometer to be inserted vertically to the bottom of the vessel.
