Easily pumps out the toughest high-viscosity urethane. These caulking guns are lightweight and can be ordered with either an aluminum or clear plastic barrel. Their lower mechanical advantage makes it slightly harder to pump urethane, but it takes less pumps to apply the urethane. The entire barrel swivels so the handle is always pointed at you. The thrust rods are heat-treated and for this reason last longer than other comparable caulking guns.