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Cleanouts in Draining Systems

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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 are required at base of stacks and at each horizontal change of 45o or more
  • if more than 1 change in direction in a run of a pipe, only 1 cleanout every 40 ft (12 m) is required
  • cleanouts should be installed every 75 - 100 ft (25 - 30 m)

Cleanouts size and clearance distance in front of the cleanout can be taken from the table below:

Cleanouts in Draining Systems
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
  • 1 inch = 25.4 mm
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