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The Mahle OE plain piston ring set uses gas-nitrided steel and is specified at 4.075 x .043, .157 RW to provide piston sealing for rebuilds and replacements. As a matched plain ring set, it supplies the listed diameter and running width to aid accurate fitment during installation and is intended for use where the precise ring dimensions are necessary to re-establish compression sealing.
Mahle Rings Performance Gas Nitride Steel 4.075 x .043 .157 RW Plain Ring Set
