A PVC Blank Plate is an essential electrical accessory used to cover unused switch boxes, electrical outlets, or wall openings. What is a Distribution Box? A distribution box, or DB box, is a circuit breaker enclosure. Made from durable PVC, cover plates are suitable for indoor applications, come in single, double and triple gang sizes and in a variety of configurations to suit your application needs. It helps maintain a clean and safe electrical installation by preventing dust, moisture, and accidental contact with internal wiring. Made from high-quality PVC material. • Insulation complies to EN 60439-1.