Need new valve for steam heat
 

Hi I have a one pipe steam heat system in my home. One of my radiators has a bad valve on it, it's basically ready to fall off and when the system is on steam shoots out of the area where it connects to the radiator. Any idea where and which part I need? I was think of getting a thermostatic radiator valve as a replacement. Here are some photos:

Something like this? http://www.pexsupply.com/Honeywell-V2043HSL10-1-8-One-Pipe-Steam-Thermostatic-Radiator-valve-includes-air-vent

That is an air vent only and is not in a location where you would use a thermostatic valve.

So where could I find a replacement air vent? And how do I determine which one to get?

Need new valve for steam heat
 

HVACR - Grainger Industrial Supply Paul

The 29.00 one should work fine