Stem injection systems used most often have silver spray stem, usually silver spray for easy replacement of stalks and machining. -To increase the longevity of the mold, spring-mounted below the injection stem to reduce harmful impact for mould and nozzles. -Use the positioning ring mounted at the top of the silver spray stem to ensure the copper plate between the nozzle and the injection stem. Positioning loops are often hard to not be my injector of air damage.
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