Only used in Cold core shooter boxes. It is made of Polyoxymethylene branded as Delrin. Because of high dimensional accuracy, there is no variability in diameter and height. The Knurled shape of the cylindrical portion enabled this vent to securely adhere to the mold. The slit is set to .25 mm and the opening has a self-cleaning reverse taper.
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Shirol, Kolhapur, Maharashtra