Sprinkler Buddy (Pack of 15) Has a 7″ Diameter – Sprinkler Head Donuts / Guards. For lawn sprinkler heads, both Rotors and Spray Head sprinklers. Remove Sprinkler Head to Install. Made in USA
Concrete Lawn Sprinkler Head Guard - 4 Inch Inside Hole. Color: Green | eBay
Sprinkler Saver - Patented Protection for Sprinkler Heads
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BackFlow Armor Small Concrete Donut SMALL SPRINKLER DONUT - Walmart.com