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<p>[QUOTE=&quot;John Anthony, post: 1786151, member: 42773&quot;]I was making a distinction between the overflow runner and the runner that attached to the casting tree. I suppose it depends on how we define &quot;sprue&quot;, but I think it&#039;s better to differentiate for the sake of clarity. From wiki...</p><p>&nbsp;</p><p><br /></p><p>&nbsp;</p><p>The metal is introduced through the sprue into the flan chamber and overflow runner. The overflow runner serves to contain the dross and feed some metal back into the main chamber as it cools, but since it has a separate function from the sprue that attaches to the tree, I think it&#039;s better terminology not to call it a sprue. It&#039;s an overflow runner.[/QUOTE]</p><p><br /></p>

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