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This Mahle plasma‑moly top piston ring is a 3.9027" diameter with 1.5mm cross‑section, specified as a plasma‑moly steel top ring for piston sealing duty. It is intended as a replacement top ring in piston assemblies sized to the listed diameter and section, providing the sealing function necessary for combustion chamber pressure retention and oil control in compatible engine builds.
Mahle Rings 3.9027 X 1.5MM Plasma-Moly Steel Top Ring Moly Ring Set
