The product is a vintage porcelain sign from the Humble Oil & Refining Company, featuring the warning Danger Low Pressure Water Line. ” This collectible advertising sign is original, measures 15″ X 8, and hails from the United States, reflecting the theme of gas and oil. The sign is white in color with red letters and serves as a piece of memorabilia from the gasoline industry. Perfect for collectors of vintage signs or fans of the history of gas and oil companies.