Duct arc seam closing tool

Duct arc seam closing tool is used with duct auto line, tdf transverse flange duct machine or tdc transverse flange duct machine, and pittsburgh lock machine. the idea duct connection includes a united joint and a right-angle side on the square elbow seam zipping. the duct arc seam closing tool works out with the seam of high quality without the help of other auxiliary connecting tools.

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