What trap size does a disposal unit typically require?

A disposal unit typically requires a 1 1/2" trap to ensure proper drainage and functionality. This size is standard because the disposal unit generates a significant amount of waste and requires adequate flow to clear debris effectively. The 1 1/2" trap allows for enough volume while preventing clogs and ensuring compliance with plumbing codes.

Larger traps, such as 2", 3", or 4", may not be suitable as they could cause issues with waste flow and might not be compatible with the typical plumbing fixtures in kitchens, which are designed around the standard 1 1/2" size. This makes the 1 1/2" trap an optimal choice for balancing efficiency in waste disposal and adhering to common plumbing regulations.