Rubber and steel injectors are designed to be inserted directly in line with damage such as cracks, loose foundations, joints, and cavities. They are then used to waterproof these areas through the application of Supershield INJECT hydro-expansive polyurethane resins, which are specifically formulated to immediately stop water infiltration. Each injector is equipped with a 'flat head' featuring a non-return valve and is used in conjunction with the Supershield INJECTOR CONNECTOR.