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Mahle OE plasma-moly top compression ring set, 4.025" diameter by .0625" thickness with .190" RW dimension. The part is described as a steel top compression ring with plasma moly treatment intended for direct-fit replacement in engines calling for these dimensions. It supports rebuilds where matching ring size and surface finish are important for sealing and longevity.
Mahle Rings Performance Plasma Moly Steel Top Compression Ring 4.025 x .0625 .190 RW Moly Ring Set
