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System is run consistently at 21.5 to 22 degrees C... Have to say that I have found similar behaviour on other makes of heads, it is just the Bulldog ones that were fitted to my current Central Heating system. Does anyone on here know of a metal bodied connector, without the plastic internal...

Hi there, I have a problem with the above heads, after a year or so the plastic body under the chrome ring which fixes them to the valve fractures and the heads fall off. I have checked the valves and they are functioning correctly. Is it possible to buy replacement heads and more importantly...

In need of basic help