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The Mahle OE plain ring set is a replacement second ring sized 3.902in x 1.0mm intended for Napier applications. Supplied as a plain steel ring set, it suits engine rebuild or maintenance tasks requiring OE-quality piston ring dimensions. Use it where a straightforward second-ring replacement is needed to restore compression control and ring seating when servicing compatible engine assemblies.
Mahle Rings Performance Steel Napier 2nd Ring 3.902in x 1.0MM .136in RW Plain Ring Set
