I realized that if a shrubbery nozzle gets accidentally cut off by a hedge trimmer and goes undetected, when the sprinklers run the resulting geyser would hit the eave of my house, causing a lot of water damage. I looked for some kind of valve that would cut off the water to a sprinkler should the flow get to a point that would indicate a broken sprinkler. I found two similar products, Geyser STOP and Geyser Miser. Geyser STOP is the smaller of the two and wouldn't be that visible on shrubbery nozzles. Geyser STOP can only be installed vertically. Geyser Miser is bigger, but can be installed in any plane. It would be good for a side-fed sprayhead. But, do these products actually work as advertised? Has anyone tried either one of these?