What must be installed on the discharge pipe of a pump located in the sump pit of a basement?

When a pump is installed in the sump pit of a basement, it is essential to include both a check valve and a full open valve on the discharge pipe. The check valve serves a critical function by preventing backflow of water into the sump pit once it has been pumped out. This backflow could otherwise cause unnecessary cycling of the pump, leading to increased wear and potential failure.

The full open valve, typically a gate valve, allows for complete isolation of the pump from the discharge system. This feature is important for maintenance purposes; if the pump requires service or replacement, the full open valve can be closed to stop the flow of water and safely perform the necessary work without flooding the area.

Having both of these valves in place ensures efficient and reliable operation of the sump pump system, enhancing its effectiveness in managing groundwater or excess water in a basement setting. The combination of preventing backflow and allowing for maintenance access is crucial for the longevity and performance of the pump system.