Graco AP Fusion Gun Front End Assembly Video

This video shows you how to take apart the Graco AP Fusion gun (the front end) and put it back together again for purposes of trouble shooting when you're spraying foam. If something goes wrong when you're spraying and your foam doesn't look right there is a good chance that you need to replace one of these o-rings in this video.

[@joelharris3389]

You did not check to see if the mixing chamber lettering was up before you screwed on the locking ring. Major issue if they do not match up when the trigger gets pulled.