TRV's or Thermostatic Radiator Valves can be fitted with a decorator cap to replace the TRV sensing head and stop the water when you need to remove your radiator from your central heating system.
Once in place, the radiator can be moved for decorating, making it far easier to paint or paper the wall behind. They are a simple and low-cost way to make decorating easier.
TRV's are designed so the head can be easily removed and replaced once the job is complete.