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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.
Unit of Measure

Specifications

Flange

N/A 150 mm

Center Neck

N/A 24/40

Side Necks

N/A 24/40