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Sonnax checkballs 10000-08 (.250") are made out of tough, wear-resistant imidized plastic. The Sonnax imidized plastic balls seal better than steel balls because they conform to the separator plate ball seats. Steel checkballs are hard and heavy, wearing separator plate ball seats from the repeated high impact of the ball on the seat. Elastomer or rubber check balls seal well. However, the elastomer material wears, reducing the size of the ball. Similar imidized plastic balls have been used on some original equipment late model valve bodies with excellent results. These imidized plastic checkballs are not available through the original manufacturer.