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The Supertech 6mm Viton valve stem seal is a single replacement seal with a 12.2mm outer diameter intended to control oil flow at the valve stem. Sold individually, this OE‑style stem seal uses Viton material for chemical and temperature resistance specified in the listing. It’s a compact service part used when repairing or rebuilding cylinder heads to restore proper valve stem sealing and reduce oil leakage into the combustion chamber.
Supertech 6mm Valve Stem Seal - Single OD 12.2mm Viton
