Essential to every drainage system is a point of release to prevent back-up issues. Use the Pop-Up Drainage Emitter to safely discharge collected water away from structures, erosion-prone landscapes, and poor drainage areas. The Pop-Up Drainage Emitter with Elbow and Adapter connects to 6 in. drain pipes. When water pressure builds, the cover “pops up” as high as 1 in. to release water at up to 88 GPM. Cover closes automatically once the flow diminishes. Cover is made of polyethylene and the elbow is made of polyvinyl chloride.