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The Mahle OE plain piston ring set (Napier THM-13) sized 4.025 x .043in with .135RW is a straightforward replacement kit for piston and engine rebuilds. These plain rings supply the essential sealing function between piston and cylinder and are sold as a matched set to ensure the correct fit when this diameter and rail width are specified.
Mahle Rings Performance Steel Napier THM-13 4.025 x .043in .135RW Plain Ring Set
