The 3M™ Flex Pack Heavy Duty Applicator Gun, 08991, dispenses single component products packaged in 450 ml and smaller flex packs. This 3M™ Flex Pack Heavy Duty Applicator Gun, 08991, is a fully enclosed all metal, rod driven, friction feed applicator gun for use with 450 ml 3M™ Windshield Urethanes. This product has a 18:1 ratio.