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outlet pipe blocked 10mm micro pipe could be blocked from manifold in attic can.nt get hold of a 10mm isolator valve to put in the attic to work on the pipe. :?

new to plumbing need advice how do you reduce the pressure or drain the system on a potterton puma 80 system need to take the pipes off one rad for repair. :( :cry: :?:

still no joy :cry:

need help new to the plumbing game my central heating system is a potterton puma one radiator is,nt working both inlet and outlet pipes cold took the radiator off to check the flow plenty of water coming out of the inlet very little out of the outlet could there be a blockage in the outlet pipe...