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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.
Unit of Measure

Specifications

Flange

N/A 150 mm

Center Neck

N/A 29/42

Side Necks

N/A 29/42