One of the best ways to clear a backed-up plumbing system is to clean out the lateral by entering through the clean-out. Removing the clean-out cap is the first step in accessing the lateral; it should only take a few seconds.
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Twist the adjusting nut to open the wrench's jaws wide enough to fit the head of the clean-out cap.
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Slide the jaws onto the head and twist the adjusting nut until the jaws are hold the head tightly.
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Push the handle to twist the cap counterclockwise and remove the cap.