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The Mahle OE plain piston ring set uses gas-nitrided steel with 4.090 x .043, .157 RW sizing to provide accurate piston sealing during engine rebuilds and replacements. Provided as a plain ring set, it matches the specified diameter and running width for correct fitment and is intended to be used where those precise dimensions are required to restore compression and proper engine operation.
Mahle Rings Performance Gas Nitride Steel 4.090 x .043 .157 RW Plain Ring Set
