FREE SHIPPING Continental U.S. 3-inch Great for Sump Pumps Keeps rodents and debris out Avoid interfering with mowers NDS Pop-Up drainage emitters act as the discharge point of a drainage system, opening easily when needed to allow water to flow freely from the pipe and away from structural foundations. The patented spring-loaded cap opens with the hydrostatic pressure of water flowing through the drain pipe, then closes as the flow diminishes. It allows water to be diverted and released to water-safe areas away from structures, erosion-prone landscapes, and poor drainage areas. The NDS pop-up drainage emitter with elbow is an easy, safe, and efficient solution to any drainage needs. Manufactured from 100% recycled HDPE Reduces trip hazard posed by open drain Pop-up top keeps rodents and debris out of system Low-rise to avoid interfering with mowers