- Compatible with engine blocks and cylinder heads that use 18 mm core plugs; press-fit cup design sized precisely for 18 mm bores - Zinc-plated carbon steel construction resists corrosion in coolant environments and supports a reliable interference fit across heat cycles - Helps seal coolant passages in the block or head to reduce leaks and maintain system integrity during rebuilds and routine maintenance - Easy to install: drive the cup flush in a clean, dry bore with the correct installer; use sealant only if specified by your service manual - Pack contents: 4 pieces of 18 mm cup type freeze/core plugs for engine overhauls, cylinder head service, and preventive maintenance
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