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Ball Bearing for Polaris Pressure-Side Cleaners filter-internal-diameter_6 1/2 inches This is a Zodiac JandyThis is a Polaris Zodiac Ball Bearing replacement for authentic Polaris pressure side pool cleaners. The ball bearing replacement enables your Polaris pressure cleaner wheel to rotate freely and without interference. In total, most compatible Polaris cleaners require 8 bearings. Compatible with these Polaris models: 380, 3900 Sport, TR35P, 360, TR36P, and ATV pressure side Vac Sweep pool cleaners.