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The Mahle plain piston ring set is a precision replacement sized Napier THM-13 3.779 x 1.2 mm with a .135in ring width, intended for piston rebuilds and restoring compression and oil control. These plain rings provide a straightforward, serviceable sealing solution for engine overhauls where factory-style ring profiles and accurate sizing are required for reliable seating and consistent ring end gaps.
Mahle Rings Performance Napier THM-13 3.779 x 1.2MM .135inRW Plain Ring Set
