NDS 420 3" & 4" Pop-up Drainage Emitter ? Big Frog Supply

Collection: Pop-Up Emitter, Material: Polyolefin, Width/Diameter: 5.9375", Height: 1.25", - Desc: the drainage pipe and away from structural foundations to safe or useful areas. For example, water can be routed from a low area next to a foundation to a water safe area such as a curbside drainage system.Opened by the hydrostatic pressure of water flowing through the drain pipe. As flow diminishes the Emitter closes again. The special patented design allows the Emitter to open with a negligible amount of pressure. Since the Emitter is closed during dry weather, debris and rodents cannot enter the drain pipes. - - 3 and 4 Inch Pop-Up Drainage Emitter - 420

The NDS Plastic Snap-On Drain Pop-Up Emitter Replacement Top opens due to the hydrostatic pressure of water flowing through the drain pipe and closes as the flow diminishes. Snap-on connection. Use for water captured by grates, catch basins, channel drains, flo-well, downspouts and roof gutter systems. Use with an elbow to divert and release water to water-safe areas away from structures, erosion-prone landscapes and poor drainage areas (elbow sold separately). Fits 3 in. and 4 in. hub sewer and drain fittings (sold separately). Blends into the surrounding landscape. Manufactured from 100% recycled plastic. Low profile to provide adequate mower clearance. Remains closed in dry weather to keep out debris and rodents. Automatically retracts and closes the emitter to help prevent damage from lawn mowers.