Torrington Supply Company was established in 1917 by David Stein, a Lithuanian emigre who came to this country as a seventeen year-old in 1905. Lacking money or formal education, he learned the plumbing trade in New York City. Soon after, he moved to New Britain, Connecticut, and eventually opened a plumbing contracting business of his own in Waterbury. Almost immediately he developed a small but growing sideline furnishing plumbing supplies to other local tradesmen. As that sideline grew, Stein realized that he preferred merchandising to contracting, and soon was in the wholesale business full-time; The Brass City Plumbing Supply Company.

The company's original name was changed to Torrington Supply Company, when, in the mid 1920's, the company moved to Torrington for a period of 10 years. In the mid 1930's, the company moved once again, back to Waterbury, and then moved to its current facility in 1988.