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There are 3 main sizes for sprinklers. Each measured based on length from top to bottom.

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4 Inch - Tiny SprinkleGuards

These refer to 4 inch pop ups.

Example: Rain Bird 1800 Series 4 in.

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6 Inch - Large SprinklerGuards

These refer to sprinklers that are 6 inches long. 

Example: K1 Gear Drive Sprinkler

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7 1/2 Inch - Extra Large SprinkleGuards

These refer to the longer and wider 7 1/2 inch sprinklers Example: K2 PRO.