Sentence:  Alan Vasen worked as an <WSD>insulator</WSD> at this site from September 1968 through mid-April 1969. Mr. Vasen installed thousands of lineal feet of asbestos pipe covering and thousands of square feet of asbestos block insulation throughout the operating units of the Benicia refinery. 
Meaning of the word marked with <WSD> tags:  A person who installs insulation.