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Inside view of 2-1/4" standing cages with production API 1-3/8" size ball inside. The light, or white area, you can see around the ball inside the cage is the area available for fluid to get past the ball and into the compression chamber of the pump. These cages would fit 2" bore RW (thin wall), 1-1/2" and 1-3/4" bore RH (heavy wall) externally threaded barrels.

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