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DOUBLE VENTING A RADIATOR
I am planning to double vent a couple radiators. I have talked to a couple people around here and they all tell me to go to a machine shop and have the radiators tapped. I have had a close look at the radiators that I want to do and they seem to have a plug. Can you have a look at the pictures and tell me what this circular thing is on my radiator? What is it likely made of? Can I just drill through it and tap the hole. Does it need to be removed and the tapping cleaned out? Or, How do you tap a radiator with what I have to work with?
I realise that I will not be tapping the inlet valve side. The other side has a vent at the top and what appears to be a plug like the one in the picture.