Love these guys! I wanted buried lines run from my downspouts away from my foundation. After talking with Hugo Cuevas & learning about his background & experience, I was put at ease! I was expecting that black corrugated black hose that you so often see....not! Hugo's way, is to install 4" PVC with a pop-up valve for water dispersement at the end of the line. It is supposed to lower back down flush with the ground once the water pressure drops. (Sounds to good to be true, we shall see!) Also, he had flush out valves at the end of the downspout in case it were to get clogged from debris running down from your roof. I liked this feature as well. All you have to do is take the cap off and run a water hose in it to clear the problem. Pretty cool! Professional, fast (next day installation!), and fair!