Which fittings connect building sewers to the main, not protruding into the main?

• A. Adapters
• B. Wyes and Tees
• C. Cleanouts
• D. Caps

Answer: (B)

Connecting a building sewer to the main is done with a side-branch fitting that ties into the main rather than extending into it. Wyes and tees are designed to create that side branch, allowing the building sewer to enter the main smoothly and maintain proper flow. The smooth entry reduces turbulence and blockages and keeps the main line continuous.

Adapters, cleanouts, and caps don’t serve this purpose. Adapters join different pipe sizes or types but aren’t used to create a lateral connection to the main. Cleanouts provide access for cleaning, not a discharge path from a building sewer into the main. Caps close the end of a pipe and stop flow, so they obviously don’t connect a building sewer to the main.