Every roll of Control Valve Decals contains 100 units of 6 in. x 2 in. (152.4 mm x 50.8 mm) self-adhesive decals that mark the location of control valves in water-based fire suppression systems. Each 6 in. x 2 in. (152.4 mm x 50.8 mm) decal reads 'Control Valve' in red letters at least one inch (25.4 mm) in height.These are used in standpipe and fire sprinkler systems to direct first responders to valves and facilitate maintenance by helping ensure valves remain open after work is complete. They help facility managers and first responders locate these valves when the water needs to be shut off or turned on. These decals feature red letters against a white background for high visibility.