You are awesome! So to make sure I understand even the olderst of rad models will have a air bleed valve and the has never been a model without one, right?
Do you know whether the left valve has to be screwed open or screwed closed (all the way down) and I have looked at some different styles of rads online to find a similar one and many do not seem to have a way to bleed them up top, but I will take your word for it. One other thing do you know...
I am new to all this and just bought an apartment building with radiators; however, they are the type that do not have the spot for a key to bleed. So 2 questions 1)Does the valve on the left need to be screwed down shut or open for heat and 2)At the right end the valve is the type with numbers...