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Depends on what needs to be fixed. Cut out a section, use a regular coupling on one end and a rubber one on the other end. The rubber one slides over the pipe, position it to match the old pipe and slide it over the cut. It is held in place with hose clamps. Depending on where the break is, there may be enough play in the pipe to push the old pipe back and use a regular coupling on both ends. If it is just a hole, there is a saddle clamp or patch that is like a section of pipe cut lengthwise and is held in place with 2 U bolts. Rubber coupling is called a FERNCO coupling in case you were wondering.

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Q: How do you repair a 4 inch ABS building drain with out taking apart the whole system?
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