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Wilwood replacement high‑volume master cylinder reservoir cap with diaphragm gasket, made from stamped steel with a black zinc plating for corrosion resistance. Designed to work with all Wilwood high‑volume master cylinders and to retrofit older composite master cylinders, this cap restores proper reservoir sealing and serviceability where the original lid or gasket requires replacement.
Wilwood Lid with Gasket - High Volume Aluminum Master Cylinder (New Style)
