Quote:
Originally Posted by widebody911
In the interest of water conservation, I dug up a sprinkler that's had a chronic leak for years. The previous owner had patched the pipe together with duct ta[e

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Looks like someone may have inadvertently kicked the head - which then applied pressure on the joint and cracked the pipe where the glue had softened it.
Most reputable irrigation contractors these days use flex joints to attach all heads.