Discharge size for a non-grinder ejector?

• A. 1-1/4 inches
• B. 2 inches
• C. 3 inches
• D. 1 inch

Answer: (B)

Discharge size is chosen to handle the typical flow from a below-grade sewage ejector and to fit standard building drainage fittings. A non-grinder ejector moves wastewater that may contain solids without grinding them, so the discharge line must be large enough to prevent blockage and maintain reliable flow. In residential practice, two inches is the standard discharge size because it provides sufficient capacity and aligns with common 2" DWV piping and connections. Smaller sizes would restrict flow and are prone to clogs, while a much larger size isn’t needed for normal loads and adds unnecessary complexity.