Danfoss 013G8019 Non-Electric Thermostatic Angle Valve Body, 3/4" FPT x MPT Union Tailpiece RA 2000 thermostatic radiator valves regulate the flow of hot water or low pressure steam through free-standing radiators, baseboards, or convectors in hot water and two-pipe steam systems, operators and valves are packaged separately to allow an installer an ability to select a suitable combination for each application Replaceable packing assembly while system is in operation Patented vapor charged bellows for quick response from valve mounted operators Snap-action mechanism for standard valve mounted operators for ease of installation and removal Without the use of tools