In one practice of the invention plastic tubes are clamped in holders wherein each of the tubes is bent into two sections. Each section has an internal bubble with the bubbles of both sections being aligned with each other. The tubes are cut through the aligned bubbles and one section of one tube is thereafter welded to another section of the other tube. In a further practice of the invention a pair of pivotal holders are provided wherein a tube is mounted in each holder with one section of one tube being out of alignment with a section of the other tube. The tubes are cut and the holders are pivoted to then align the two sections for being welded together.
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