Gusmer D-Gun Cleaning: The Mixing Chamber Block Part 5 Announcements / Foam Insulation News Posted by Admin on Sep 04, 2006 - 11:59 AM This step will be repeated by the applicator usually twice a job or more.  A clean injection port will result in a properly configured spray pattern and proper application of polyurethane spray on foam insulation.  You can see the tip cleaner being inserted and removing any foreign material from the mix module.  Try this with the F-Gun (F for you guessed it - Take the F'in thing back it doesn't spray foam.) This article comes from Canada Foam Insulation   http://www.foam-insulation.ca/ The URL for this story is:   http://www.foam-insulation.ca/modules.php?op=modload&name=News&file=article&sid=22