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The Mahle OE plain ring set is a performance steel Napier THM-13 piston ring package sized 4.135 in with .043 in thickness and .135 ring width. Offered as a single plain ring set, it provides a source-faithful replacement for piston sealing and compression control in engine rebuilds that specify these exact dimensions.
Mahle Rings Performance Steel Napier THM-13 4.135 x .043 .135 RW Plain Ring Set
