The Unger OptiLoc Inside Locking Collar is a gray plastic replacement component for Unger OptiLoc extension poles. It is available in small (25 mm) and large (29 mm) sizes. The 25 mm collar fits the 2-section model or the smaller inside locking collar position on the 3-section model, while the 29 mm collar fits the larger inside locking collar position on the 3-section model.
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