Safety Technology International Inc.
STI Universal Stopper
The STI Universal Stopper (STI-13510FR) helps prevent false fire alarms while it guards against accidental or intentional physical damage. Indoor/outdoor clear polycarbonate cover is a waterproof Type 4X cover with an enclosed back box, open mounting plate and “In Case of Fire…” label. It is sized to fit most pull stations and has a high strength continuous hinge. Other mounting options include surface or flush, with or without a horn. It is designed to comply with ADA (less than four inches in depth) and is UL/cUL Listed.
https://www.sti-usa.com/category/FireProducts/UniversalStopperCovers/index.htm