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Hello, a second query, this one about a normal radiator. All my other radiators have a thermostatic control at one end and a valve at the other which you just turn all the way to the left for on and all the way to the right for off. I understand these! I have one in the loft which has been cold for ages. I want to check it is actually on. The pin is up under the thermostatic valve so that end is ok. The other end has a cap, and under the cap it looks like the photo attached. Am I meant to turn that with pliers to make sure it is on??