Air Locke Dock Seal's RS² model of rail seals features formed square corners, an insulated passageway leading to and from the rail car and a tight seal. The RS² is also supported by specially designed stretch cords on the outer wall when it is deflated. Its design creates a trough on the upper seal to disperse any water to both sides. The standard size of this model provides access to a full width of 10' and a height of 9.5'. Its outward protection is determined by its wall to center-of-track distance. This model is inflated by a switch-operated, 1/6 hp wall-mounted blower (switch not included).