The mechanical gasket double electrical box protector is used in conjunction with metal socket boxes and light switch boxes. The socket gasket prevents the spread of fire through holes made for wiring. The gasket is designed not to impede internal wiring and can be penetrated easily for wires and cables to pass through
Used with metal socket boxes where the fire and acoustic properties would be infringed. The gasket is designed to comply with IEE Regulations and British Standards.