Main Drain Decals are an NFPA 13-compliant marker designed to indicate the location of a main drain to inspectors and fire professionals. Each 6 in. x 2 in. (152.4 mm x 50.8 mm) decal reads 'Main Drain' in red letters at least one inch (25.4 mm) in height.
Main Drain decals indicate that a valve serves as the main point to drain water from a fire sprinkler system and measure water flow during testing. This decal features a strong adhesive for easy application.