Safety Technology International, Inc. STI-13210FR Universal Stopper, Surface Mount  with Conduit Knockouts and Fire Label, Indoor/Outdoor Polycarbonate Protective Cover for Pull Stations or Call Points Indoor outdoor cover protects against vandalism and accidental damage Protects pull stations and call points from damage Cover molded from thick tough polycarbonate material High strength continuous hinge Three year guarantee against breakage of the polycarbonate in normal use.