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The Mahle OE plain piston ring set (Napier THM-13) sized 4.035 x .043 with .135 RW is a standard replacement kit for piston rebuilds. These plain rings restore the piston sealing surface during engine overhaul work and are supplied as a matched set to ensure correct fit for applications that call for this exact diameter and rail width.
Mahle Rings Performance Steel Napier THM-13 4.035 x .043 .135 RW Plain Ring Set
