Take water downstream and away from structures, erosion-prone landscapes, and poor drainage areas to discharge from a Pop-Up Drainage Emitter as a point of release. The Pop-Up Emitter with Elbow connects to 3 in. sewer and drain pipes. As water pressure builds, the cap “pops up” as high as 1 in., disperses water at up to 40 GPM, and closes once the flow diminishes. Cap stays closed when not in use to prevent debris rodents from entering and potentially clogging the drainage system. Weep hole at bottom of elbow drains out water left in pipes to prevent stagnation or freezing in cold weather. The flat profile design blends discreetly into the surrounding landscape. Cap and cover made of polyethylene; elbow made of polyvinyl chloride. Pop-Up Emitters are a part of a complete drainage system that help with stormwater management. They work with pipes, catch basin drains, channel drains, trench drains, and drain grates to filter, capture, and convey excess water to drain pipes; the pipes carry the water downstream to discharge with a Pop-Up Emitter, or to percolate into the ground with a dry well or infiltration trench. Use our free drainage calculators, Home Drainage Center, and NDS Stormwater Drainage mobile app to find the best solution for your specific drainage problem. NDS, founded in 1972, is the preferred choice of professionals and offers proven products, tools, and expert support to help you get the job done right. NDS 6-in L x 6-in W x 3-in dia Emitter | L322GB