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The Mahle 3 mm piston ring support rail sized for 4.125–4.185 bores is a replacement support component for piston ring assemblies in that bore range. It is supplied to restore correct ring seating and support within the specified dimensions during engine rebuild or repair. Verify bore measurements and ring specifications to ensure the support rail matches the engine's requirements.
Mahle MS 4.125-4.185 3mm Support Rail
