Founded in 1921, Blackman Plumbing Supply is one of the largest, family-owned suppliers of plumbing, industrial, and heating, ventilation and air conditioning equipment in the United States. It has more than 10 branch locations and showrooms in New York. The company also offers residential and commercial fixtures and supplies for schools, hospitals, office complexes and apartment houses. Blackman Plumbing Supply provides products from various manufacturers, including McDonnell & Miller, Holby Valve Company, Mission Rubber Company and Mountain Plumbing Products. In addition, it offers billing, product bar coding and boom truck services. The company provides automatic fax invoicing solutions. Blackman Plumbing Supply maintains a distribution center.