A conventional fire hydrant has a spindle extension outside the hydrant riser. As a closing device for a conventional underground fire hydrant, an underground hydrant
a standard DN100 damper is used.
Telescopic hydrants are provided with a telescopic movable quick-connect flange, the bolts of which can be moved to move the plastic tube inside the stainless steel riser as required. Telescopic adjustment allows the hydrant installer to adjust the length of the hydrant in unforeseen situations.
All hydrants, regardless of type, are equipped with an automatic drain valve. The automatic drain valve allows the newly used fire hydrant to drain from the ground or well after the pressure has been lost, thus preventing the hydrant riser from freezing.