"Heating circulation problems are often due to air locks caused by trapped air pockets at high points in the system. e.g. when a pipe goes up and then down again. The use of this magical air vent in this situation remedies the problem and prevents its recurrence."
"I bought these valves as I kept getting air in my central heating. There were some pipe going over rafters, when I fitted these ARV they cured the problem straight away. The Central heating now works perfectly"
""Very disappointed. I purchased 3 of these, used one & took the other two back. The Comap which screwfix seem to phasing out in favor of this rubbish version, in my opinion was better quality & value for money.."
"Very disappointed. I purchased 4 of these items and the all leaked around the joint where the mechanism attaches to the body. Customer called at 7am to say water dripping through ceiling, I was not impressed with this product."