What type of sprinklers has been recalled due to safety concerns?

Cycling sprinklers have been recalled due to safety concerns primarily related to their operational reliability and the potential risk they pose in certain situations. These sprinklers feature a design that relies on moving parts to distribute water, and issues may arise when these mechanisms malfunction. When cycling sprinklers fail to operate as intended, they can result in inadequate lawn coverage or create unpredictable water flows that may lead to water wastage or localized flooding.

The recall is typically implemented when manufacturers or safety regulators identify that the operational failures pose a significant risk to users or to the environment. The recall process aims to mitigate such risks by informing users and providing solutions, whether through repairs, replacements, or refunds.

In contrast, the other types of sprinklers mentioned, such as standard, adjustable, and rotary sprinklers, have generally not faced the same level of safety concerns or recalls. Each of these mechanisms operates differently, often with more reliable structures, making them less prone to the specific failures that led to the recall of cycling sprinklers. Hence, the choice of cycling sprinklers as the correct answer reflects an understanding of the operational challenges and safety implications associated with this particular type of sprinkler.