A grinnell coupling refers to a type of grooved pipe connection that has become widely used in fire protection and piping systems around the world. The name “Grinnell” originates from Frederick Grinnell, an American inventor active in the late 19th and early 20th century. Grinnell played a crucial role in the development and promotion of fire sprinkler systems and their associated pip... https://archpipes.com/news/company-blogs-en/what-is-a-grinnell-coupling/