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The Mahle 3 mm piston ring support rail sized for 4.250–4.290 bores is provided as a replacement support rail for piston ring assemblies matching that bore range. It helps maintain correct ring positioning and support during engine operation when installed to factory dimensions. Ensure bore size compatibility prior to purchase to confirm fit with the engine being serviced.
Mahle MS 4.250-4.290 3mm Support Rail
