Foam N ' 8 ? . lengthy limber integrative extension straw for all FNS series foam dispensing guns. The 8 '' lengthy limber integrative extension tube the reach of the FNS series guns and is abstract for foam dispensing in knotty to reach areas or in areas where space is constricted like-minded close corners. all outstanding brands of foam sealant dispensing guns with a barb brass nozzle tip such as as the eminent Stuff Pro 13. The extension tube is not to primed foam guns with a glossy dispensing gun tip. in a pack of five 8 '' lengthy extension straw tubes.