Coupling, filter and flow indicator ‒ newly developed by bfs, known for its premium quality battery filling systems ‒ are key elements in supplying water to industrial batteries. The products are compact, robust and self-explanatory. The coupling's patented mechanism, in an acid resistant plastic housing, makes it unique, allowing one click detachment by an intuitive operation, while being compatible with established products. The design minimizes the risk of damage in a rough industrial environment by harmonizing perfectly with the system’s tubing, simultaneously achieving a more clear and structured working ambience.