According to code, the size of any pump or discharge pipe from a sump (ejector) having a water closet connected thereto shall not be less than?

The correct answer is 2 inches because plumbing codes are designed to ensure safe and efficient drainage away from fixtures like water closets. When dealing with discharge pipes from sump pumps or ejectors connected to a water closet, a minimum diameter of 2 inches is often mandated to prevent clogs and allow for adequate flow of waste.

A 2-inch discharge pipe provides sufficient capacity for the volume of waste typically associated with water closets, ensuring that sewage can be effectively moved without backing up. The risk of obstruction is higher with smaller pipe diameters, particularly in systems where solid waste is present. Using this specified size helps maintain the integrity of the plumbing system and minimizes the chance of emergencies such as overflows or blockages, which can lead to hazardous conditions.

In contrast, smaller options like 1 inch or 1.5 inches do not provide the necessary capacity or flow rate required for the effective discharge of wastewater from a water closet, increasing the risk of plumbing system failures. A 3-inch pipe, while compliant, is larger than needed and may not be as practical or necessary for typical residential plumbing applications. Therefore, 2 inches strikes an ideal balance between efficiency and effectiveness, aligning with plumbing codes and best practices.