Use a locksheld, once the Reds have been balanced correctly there is no further need to adjust this valve, whereas a â€˜wheel-head valveâ€™ can be adjusted by â€˜board fingersâ€™. You only need to fit a â€˜drain valveâ€™ on the lowest past of the CH system, or if the pipes feeding the Rad drop down from the floor above and then loop back up, then fit a drain valve as you would have no other way of draining this part of the system.
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