What two components are required on a sewage ejector pump?

The correct answer involves having a full-open valve and a backwater or swing check valve as essential components of a sewage ejector pump system. The full-open valve is crucial for allowing the flow of sewage to be controlled and managed effectively, providing the necessary functionality for service and maintenance. In addition, the backwater or swing check valve plays a vital role in preventing backflow, ensuring that sewage does not flow backward into the pumping system when the pump is off or during maintenance. This is especially important in a sewage system to protect against contamination and maintain proper operation.

Other options, while they may contain elements that could be part of a pumping system, do not address the core requirements specific to sewage ejector pumps. For example, a pressure gauge and air vent are not standard for typical sewage ejector applications, and while a float switch and power supply are necessary for pump operation, they do not ensure the same level of flow control and prevention of backflow that the correct components provide. The discharge pipe and control panel are also relevant but do not encompass the primary safety and functionality aspects covered by the chosen components.