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Mahle plain piston ring set for the Napier THM-13 with 4.005 in bore and 1.5 mm ring width is supplied as a direct-replacement ring set for engine rebuilds. These plain rings are intended to reestablish proper sealing and compression where original rings are worn, offering specification-matched sizing for compatible engines and reconditioning projects.
Mahle Rings Performance Napier THM-13 4.005in x 1.5MM Plain Ring Set
