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The Mahle OE plain piston ring set (Napier THM-13) sized 4.055 x .043 with .135 RW is a basic replacement ring kit for engine rebuilds. These plain rings supply the essential sealing surface for piston-to-cylinder contact and are sold as a set for matching pistons during overhaul work. Use for piston ring replacement where this exact size and ring specification are required.
Mahle Rings Performance Steel Napier THM-13 4.055 x .043 .135 RW Plain Ring Set
