I have a blockage on a flow pipe to one small radiator.
I would like to try connecting something - by way of the radiator drain incorporated in the valve to allow me to suck - blow in succession to try to loosen the blockage.
Using the mains pressure in the system won't move it - but I would like to try depressurising the system and using the sort of technique we use with a sink plunger - but I cant think what to use.
Any ideas?