Make the transition from Pop-Up Drainage Emitter with Elbow to 3 in. & 4 in. single-wall corrugated pipes and 4 in. Sch. 40 pipe with this Adapter. Attach to elbow and connect desired pipe. Adapter is made of high-impact polystyrene (HIPS) Pop-Up Drainage Emitters are part of a complete drainage system used for stormwater management. They work with pipes, catch basin drains, channel drains, trench drains, and drain grates that 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.