column radiator
Device consisting of vertical columns through which hot water circulates; the inherent heat is transferred to the ambient air.
regulating valve 
Device for regulating the volume of water circulating through a radiator.
covering grille 
A radiator’s decorative cover.
hot-water outlet 
Valve for draining the water from the radiator.
column 
Vertical tube through which the water flows.
bleeder valve 
Mechanism for releasing air that occasionally accumulates at the top of the radiator.