LITHONIA LIGHTING® Wet location/vapour tight luminaire with fiberglass housing integral perimeter channel utilizes continuous poured-in-place NEMA 4X gasket. Simple two-piece design consists of housing and optical assembly to streamline installation process. It has acrylic diffuser. Injection-molded, acrylic lens (0.08 inch thick), provides high impact-resistance comparable to 100% DR. Suitable for transit, parking garage, awnings, cold storage, food processing, docks, schools, hospitals, carwashes, natatoriums and exterior environment applications.