NDS 422G Pop-Up Drainage Emitter with Elbow fits 4-Inch Sewer and Drain Pipe, Works with Drainage Systems Including Catch Basins, Green

Works like a charm. I went a bit further and actually built a dry-well, putting a 5' hole filled with rock under the emitter. Instead of the 90 degree elbow my emitter is installed on top of a 4" PVC T. I utilized the 90 at my downspout. My drainage now goes under my patio slab sidewalk. My hope is this takes me into colder weather to provide continued drainage below the frost, but I'm not certain how that will work in the dead of winter. Not much water flows in those months anyway. During heavy extended rainfall the pop-up just spills on the lawn anything my dry-well can't handle. Installed at ground level I can take the lawn mower right over it as advertised, worry free. I went to all the big hardware stores for any device like this and they looked at me like I had 2 heads. I found none of the chain stores in my area sold them or really knew what I was trying to build. No problem buying one here on Amazon though. So far, I'd recommend this device to anybody wanting to get rid of a troublesome downspout and drain sitting in a traffic area. A little work trenching, but no more tripping hazard.

I used this to fix a french drain exit that didn't have a cover. Worked great as expected. The extra adapter was helpful as the PVC elbow is 3" and the corrugated pipe I was connecting to was 4"

I absolutely trust NDS products! This pop up works great and stays open while under water. Well made and great for 4" pvc, sch. 40 pipe (or) flex pipe with adaptor. Sugg: Buy

This works in normal to heavy rain… but in torrential rain you need to check them afterwards because the green top can blow off. Also they did not fit ideally to our drain pipes but my husband and was able to make them work.

excellent