NDS 4" Pop Up Center Drive Polyolefin Pop Up Drainage Emitter with UV Inhibitor. It fits 3" & 4" hub sewer & drain fittings. The pop-up does not rise high enough to interfere with mowers and its green color blends into the surrounding landscape. It keeps out debris & rodents during dry weather. The emitter opens by the hydrostatic pressure of water flowing through the drain pipe and closes again as flow diminishes. Includes pop-up drainage emitter with either 3 inch or 4 inch PVC S & D elbow.

• 4 in.
• Fits 3 in. & 4 in. hub sewer & drain fittings.
• Pop up does not rise high enough to interfere with the mower.
• Blends into the surrounding landscape.
• Closed during dry weather to keep out debris & rodents.
• Closed during dry weather, keeping debris and rodents out