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The Mahle OE plain piston ring set (Napier THM-13) sized 4.010 x .043in with .135RW is a standard replacement kit for piston rebuilds. These plain rings restore the sealing surface between piston and cylinder and are sold as a matched set to ensure correct fit and function for engines that require this diameter and rail width.
Mahle Rings Performance Steel Napier THM-13 4.010 x .043in .135RW Plain Ring Set
