How should horizontal branch connections to the stack be made?

The best practice for making horizontal branch connections to the stack is to use a sanitary tee or a long radius tee-wye. This method is appropriate because it helps maintain proper flow and prevents the potential for clogs or backflow within the drainage system.

A sanitary tee is specifically designed to facilitate the smooth transition of waste materials from the horizontal branch to the vertical stack while minimizing turbulence. This design reduces the likelihood of blockages that can occur with improper connections. The long radius tee-wye also allows for a more gradual change in direction, which promotes better drainage flow compared to standard tees or sharp bends.

Using these fittings helps ensure that the horizontal branches drain effectively and helps prevent any issues related to drainage or venting that may arise if improper fittings were to be used.