Pressure fillers are specialized tools used in various industries to inject materials into cavities or spaces under pressure. They ensure that the filling material, such as concrete or adhesives, is evenly distributed and reaches all areas, which is crucial for structural integrity and performance. These devices can be found in applications like construction, automotive manufacturing, and packaging. By applying pressure, they help to minimize air pockets and ensure a tight seal, enhancing the durability and effectiveness of the filled product.