well I did an install and included a three year warranty. the next week rolled around and the homeowner's calling about a leak. I checked it out and all it was, was a shrub was planted in front of a head causing water to puddle up. SO I moved the head over. As I'm walking back to the truck I noticed a rain-sensor on the gutter, and sure enough her landscapper installed it after I insalled the system. On my contract it states no one shall work on the system without my knowledge or authorization to make adjustments.