The discharge line on a sewage ejector line requires which device?

• A. Check Valve
• B. Gate Valve
• C. Union
• D. Backwater Valve

Answer: (A)

Backflow protection for a sewage ejector discharge relies on a one-way valve placed in the discharge line. This valve lets sewage move from the pump toward the sewer but immediately blocks any attempt of wastewater to flow back into the ejector pit when the downstream sewer is surcharged. Installing this check valve keeps the ejector pump protected from reverse flow, prevents flooding of the pit, and reduces odors.

A gate valve is only a shutoff that stops flow in either direction when closed; it doesn’t prevent reverse flow on an active system. A union is just a coupling for joining pipes and doesn’t affect flow direction. A backwater valve can protect a building’s main sewer from backflow, but for the specific discharge line of a sewage ejector, a check valve—the one-way device directly on the discharge path—is the appropriate and typically required choice.