The Rothenberger 11008 Expander Head (5/16"OD) is a genuine Rothenberger product. This standard riveted expander head fits similar expanders from other brands, and has an extra-long segment that ensures proper coupling dimensions. It's beveled at the segment end to allow recalibration of unround tubes and fittings, and it's smooth-running screw thread allows you to change heads quickly.
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