Pneumatic gun for application and extrusion of sealant products such as silicone, putty, glue etc. Packaged in 300 and 400 ml soft packs. Gun constructed in aluminum. Handgrip is positioned in the middle of the holding tube for easy balancing with one hand.  Handgrip is made from solvent resistant nylon. Pressure reducing valve is standard. A rapid relief valve avoids dripping of product after user releases trigger.