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Drain cleanouts provide access to the sewer for cleaning without disassembling appliances like toilets or pipes.

Sewers in modern plastic materials, properly designed and installed, should require minimal or no maintenance.
Cleanouts size and clearance distance in front of the cleanout can be taken from the table below:
| Pipe Size (in) |
Cleanout Size (in) |
Clearance (in) |
| 1 /1/2 | 1 1/2 | 12 |
| 2 | 1 1/2 | 12 |
| 2 1/2 | 2 1/2 | 12 |
| 3 | 2 1/2 | 18 |
| 4 or larger | 3 1/2 | 18 |
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