NDS Pop-Up Drainage Emitter is designed to efficiently manage water captured by grates, catch basins, channel drains, downspouts, and roof gutter systems. It allows water to flow through the drainage pipe and away from structural foundations to safe or useful areas, preventing water damage. The emitter operates by opening through the hydrostatic pressure of water flowing through the drain pipe and closes automatically as the flow diminishes. Its low profile ensures it does not interfere with lawn maintenance, and its green color helps it blend seamlessly into the surrounding landscape. This product fits smooth wall PVC sewer and drain pipes and includes a pop-up drainage emitter with either a 3" or 4" PVC sewer and drain elbow, making it a versatile and practical solution for drainage needs. Model Number: 422