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705: use all stainless steel refined but become, aerodynamic groove design makes the best use of the compressed air, the lowest noise at the same time.Can produce five times larger than Feizhuo701 purging force (15 Newton) (3.3 LBS).Big purging force is applied to industry, such as steel mills.Can be used in high temperature environment.With 701, 703, 701 and 720 belong to Feizhuo700 series.