The National Automatic Sprinkler Industry Trust Funds provide pension and health care benefits to about 20,000 active and retired sprinkler fitters and their families. Sprinkler Fitters install, repair and maintain fire sprinkler systems in industrial, commercial and residential buildings to protect lives and property. These participants are members of the 16 straight-line Sprinkler Local Unions of the United Association. Participating sprinkler fitters work for over 700 sprinkler contractors, many of which are members of the National Fire Sprinkler Association.