Cleaining your Gusmer D-Gun Part 2 Cleaning the Trigger. Announcements / Foam Insulation News Posted by Admin on Sep 04, 2006 - 11:45 AM Triggering is best described by sound.  You know your applicator is working the gun properly if you hear constant steady interspaced clicks coming from your proportioner unit.  A faulty trigger can cause all kinds of problems.  Making sure your D-Gun Trigger is clean at the start of the foam insulation job can save you alot of problems down the road. 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=19