Froth-Pak 620. Gun and hose assembly. Part 3 of a kit of 3. Includes 15' hose, 1 dispensing gun and wrench. Must be used BMR code 038-3727 (resin) and BMR code 038-3736 (catalyseur).Covers 620 square feet when vaporizing 1" thickness. The more you vaporize thick the more you diminish the dimension in square feet. The calculation is done by a rule of 3.