Peter Howell
Hi sandie unfortunately these type of air vents can be a bit troublesome being that they go directly into the rad rather than in a bleed but on the end of a rad Be carful because if it shears off you will be in a pickle if they appear to be stuck it could just be a build up of paint around them you could try chipping that off with a small screwdriver or something similar If you have success it’s righty tight lefty loose remember if they are a the back of the rad you are working back to front Good luck