Since 1980 bfs has been exclusively producing single point watering systems for industrial batteries. The basic element of the system is the bfs plug whose most important operational and flexibility characteristics are protected by key patents. The reliable, well tested mechanism inside the plug allows the battery to be filled with water at pressures ranging from 0.2 to 3.8 bars (3 - 53 psi). Only bfs offers such a unique performance and a variety of specialty plugs to meet specific needs of the battery industry. 30 years of research and development have shaped the technology of this system. The production and sales of nearly 9,000,000 plugs per year have made the company the global market leader in this field.