The straight filler neck (art. 1703) consists of three parts:
- Quick-fit swivel coupling
- Socket weld insert flange
When the tank is filled with water, the hose connected to the water tank couples with the quick-fit swivel coupling.
On the other side, a pipe welded onto the insert flange allows the water to flow through the piping of the wagon. Any impurities and foreign bodies are retained by the filter .