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Title: Only good for full circles...
Review: I bought two of these from Amazon. After using them for a week, the collar rings which control how far left and right the sprinkler rotates started to move along with the sprinkler head. They are simple tensioned metal clips that are easily stripped/sprung after a couple of uses. They are not the clips/rings that are shown in the picture. The ones shown in the picture are similar to the one Rainbird puts on their sprinklers (which are much better quality). So in essence, they are falsely advertised here on the web. I contacted Nelson customer service for replacement collars or sprinklers and they said they could not help me! Very nice!! Oh, and these sprinklers also say MADE IN CHINA...this would explain the poor quality. Nelson is now off my list of manufacturers to buy from.
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