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The Mahle OE plain piston ring set (Napier THM-13) sized 4.015 x .043in with .135RW is a basic replacement kit intended for piston rebuilds and engine maintenance. These plain rings restore the piston sealing surface and are supplied as a matched set to make piston ring replacement straightforward when this exact diameter and rail width are specified.
Mahle Rings Performance Steel Napier THM-13 4.015 x .043in .135RW Plain Ring Set
