| 摘要 |
This invention concerns branched connectors for joining single walled corrugated or double walled corrugated pipe. A method of forming a branched junction comprises forming tube of the type to be joined with smooth patches which are later excised so that sections of the tube may be fitted and sealed together to form the connectors. The invention includes special mold blocks for use in a travelling mold tunnel to form the smooth regions and/or special inserts for standard mold blocks to adapt them for forming smooth walled regions.
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