488Red Devil’s Extreme Duty caulk gun has a 26: 1 thrust ratio applicator with 950 pounds of force! it is especially useful for high viscosity materials that are hard to extrude, like hybrid adhesives and epoxies. It has an ergonomic rubber trigger and push release for better comfort and grip. The revolving, easy-load barrel comes with a “no drip” feature and a seal puncture tool. 1/10 gallon barrel holds most standard cartridges.