<http://schema.org/description>
"&lt;p&gt;Putting one or two vents between the feed throat and die is a good way to remove moisture, trapped air, and other volatiles from melted plastic as it moves through an extruder.&lt;/p&gt;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.ptonline.com/articles/how-to-fix-vent-flow-problems>