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Reference.org
Core plug
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<p>Core plugs, welch plugs, or freeze plugs are used to fill the <a href="/facts/Sand_casting/4CxgH5qt">sand casting</a> <a href="/facts/Core_(manufacturing)/Sv5KodTV">core</a> holes found on water-cooled <a href="/facts/Internal_combustion_engine/Ju4BXzj0">internal combustion engines</a>, </p>