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Mahle Performance Plain Ring Set Napier THM-13 sized 4.180 x .043 with .135in RW is a single plain compression ring set offered for engine service or rebuilds. The rings match the specified dimension and tension for applications requiring the Napier THM-13 specification and are supplied as direct replacement plain rings for compatible piston assemblies.
Mahle Rings Performance Napier THM-13 4.180 x .043 .135in RW Plain Ring Set
