A two-way cleanout is unnecessary if the building drain is extended to a manhole that is how many feet away or less from the building?

A two-way cleanout is not required if the building drain is extended to a manhole that is 50 feet away or less from the building. This is in alignment with plumbing codes that provide guidelines for the installation of cleanouts based on the distance to existing access points, such as manholes.

The rationale behind this guideline is that within this distance, it is generally considered accessible for maintenance and cleaning purposes. If issues arise within the drain system, a manhole located within this proximity allows for effective access to flush or clean the line without necessitating additional cleanout fittings.

Understanding these requirements helps ensure that plumbing systems are both functional and maintainable, reducing potential blockages or backups that could occur over longer distances without adequate access points.