Its the end of the radiator that has got a cap that you cannot turn by hand
It is used for balancing heating systems and yes most should have though I have seen ones that you turn on both ends
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local