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  1. A clean-out (TEE) shall be provided within 24 inches of a building, or as close as reasonably possible.
  2. Clean-outs shall be installed at abrupt turns of 90 degrees or higher except where a long radius sweep is used, and in excessively long installations (every 90 feet).
  3. An approved backflow protection device shall be installed at cleanout nearest to the building. The device shall contain an airtight seal at its upper end and shall be a sewer relief device (i.e., sewer popper), or approved equal.
  4. All clean-outs shall be brought to the surface. Christy Box with a metal lid shall be installed if necessary to protect from damage or trip hazard.
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