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Manual hydraulic mechanism expands tubing, replacing the need for additional couplings. Because only one side needs to be brazed, the possibility of leaks is reduced. Simply deburr the tube, anneal if necessary, screw on the appropriate expander head, insert into tube, set tool to "on", pump the handles until the tube is fully expanded to selected head setting, set tool to "off" to loosen the tubing and it's ready for brazing.
Yellow Jacket® Hydraulic Tube Expander Kit