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In injection of transfer molding, the orifice containing plug at the end of the injection cylinder or transfer chamber which contacts the mold sprue bushing and directs the molten resin into the mold. The nozzle is shaped to form a seal under pressure against the sprue bushing. Its orifice is shaped by tapering to maintain the desired flow of resin, and sometimes contains a check valve to prevent back flow, or an on-off valve to interrupt the flow at any desired point in the molding cycle.