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The Supertech titanium retainer for Opel Z18 is specified for a 5.0mm valve stem at standard installed height and is supplied as a single unit. It functions as the replacement retainer that secures spring and keeper on Z18 cylinder heads, preserving the correct installed height and seat geometry for individual‑component replacement or one‑off valvetrain repairs.
Supertech Titanium Retainer for Opel Z18 5.0mm Valve Stem Std Installed Height - Single (D/S Only)
