11 Thermostatic mixing valves for showers, bath tubs, lavatories, emergency washing devices, and hot and cold water distribution systems; plumbing fittings, namely, pressure regulating valves for showers, bath tubs, lavatories, emergency washing devices, hot and cold water distribution systems, and fire protection sprinkler systems; plumbing fittings, namely, backflow regulating valves for showers, bath tubs, lavatories, emergency washing devices, and hot and cold water distribution systems