Features:

Provide Precise and Automatic Control of Room Temperature in Two-Pipe Systems by Modulating the Flow of Hot Water or Steam Through Free-Standing Radiators, Convectors and Other Heating Unit's with High Capacity Requirements
Continually Monitor and Adjust Room Temperature for Consistent Comfort and Relief from Under-Heating and Overheating
Designed with the Higher Capacity Normally Required by North American Heating Systems
Valve Seat Disc, Which is Made of Resilient Material (Perm), Ensures Tight Shut-Off on Steam or Hot Water Systems
Nickel-Plated Bronze Casted Body with Working Parts in Cartridge Insert for Ease of Service
Controls Include Sensor, Set Point Dial and Valve Actuator
Components May be Integral or Connected by Capillary Tube

Specifications:

Manufacturer: Honeywell
Manufacturer Part Number: T104A1040
Product Type: Thermostatic Radiator Valve Actuator
Operating Temperature 43 to 79 Deg F (Ambient)
Collar Diameter 1 19/32"
Sensor Type Integral
Dimensions: 3.85" x 2.5" x 2.1"
Weight: 0.28 lb.